Heather Summary: Caitlin Mullen’s Pine Barrens Mystery
TL;DR: The Short Version
When a newly appointed police chief pulls over her own estranged mother for driving drunk, the routine traffic stop sets off a chain of events that reaches back three decades.
Caitlin Mullen’s Heather follows thirty-year-old Callie Hauser as she takes the top law enforcement job in Pine Lakes, New Jersey—a small town where the Pine Barrens hold more than trees and sand.
The discovery of an unidentified infant’s cold case, known only as “Baby Doe,” pulls Callie into an investigation that intersects with local power dynasties, missing teenage girls, and questions about her own origins.
Mullen’s novel moves between 1990s flashbacks and the present day, tracing how secrets in small towns tend to stay buried only until someone starts digging.
- Premise: A former Newark narcotics detective becomes police chief in a rural New Jersey town and reopens a 30-year-old cold case involving a dead newborn.
- Structure: Dual timelines (1990–1991 and 2023–2024) told through three female perspectives—Callie, Annabelle, and Blair.
- Setting: The New Jersey Pine Barrens, rendered as a character in itself—dense, secretive, and full of hidden depths.
- Core themes: Intergenerational trauma, small-town corruption, the ethics of true-crime exploitation, and the cost of reinvention.
- Tone: Atmospheric, dark, introspective, and emotionally grounded rather than action-driven.
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Characters In This Book
| Character | Role |
|---|---|
| Callie Hauser | Thirty-year-old former Newark narcotics detective appointed Police Chief of Pine Lakes who reopens the Baby Doe cold case. |
| Annabelle Riley / Iris Owens | Sabrina’s identical twin sister and Baby Doe’s biological mother who fled to New York under a new identity after 1991. |
| Sabrina Riley | Annabelle’s rebellious identical twin who is murdered on March 1, 1991, after attempting to blackmail Luke Caputo. |
| Jenna Barry / Hauser | Callie’s estranged, alcoholic mother who discovered Baby Doe as a sixteen-year-old newspaper carrier in 1991. |
| Jane Caputo | Callie’s lifelong best friend and Damien Caputo’s wife who shoots her husband to save Callie’s life. |
| Damien Caputo | Luke’s younger brother who murdered Sabrina Riley in 1991 and later attempts to kill Callie at a sinkhole. |
| Luke Caputo (“The Coyote”) | Former police officer and plant nursery owner who fathered children with both Annabelle Riley and Jenna Barry. |
| Frank Caputo | Retired Police Chief and father to Luke and Damien who covered up his sons’ misconduct for decades. |
| Blair Owens | Annabelle’s eighteen-year-old daughter in Cortlandt, New York whose genetic testing kit inadvertently exposes her mother’s identity. |
| Adrian | Stockton University marine scientist and kayaker who becomes Callie’s romantic partner. |
| Benny Healey | Cold case detective in North Jersey who assists Callie with DNA testing on Baby Doe’s remains. |
| Rebecca Nixon | Genetic genealogist who leaks Annabelle’s identity on TikTok, triggering a media frenzy. |
| Billy Fauver | Local mechanic with a criminal record falsely suspected of Sabrina’s murder who dies of an overdose. |
| Trent Brentwood | Local fishmonger and former high school acquaintance of Sabrina who directs Callie toward Annabelle. |
| Lynne Hamilton | Annabelle’s former AP History teacher and yearbook adviser in Pine Lakes. |
| Wren | Journalist who writes the exposĂ© “The Devil in the Pines” about Luke Caputo’s crimes. |
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Book Details
- Genre & Subgenre: Crime Fiction / Psychological Thriller / Domestic Noir / Small-Town Gothic Mystery
- Core Narrative Tropes: Identical twins, cold case investigation, dual timelines, corrupt small-town dynasty, returning police chief, consumer genetic testing twist
- Tone & Atmosphere: Atmospheric, dark, melancholic, claustrophobic, introspective
- Primary Conflict: Callie Hauser’s effort to solve the Baby Doe cold case while confronting the Caputo family’s corruption and her own origin story
- Pacing Style: Multi-POV, dual-timeline slow-burn mystery with historical flashbacks mirroring present-day revelations
- ISBN: 978-1250400574 (ISBN-13); 1250400570 (ISBN-10)
- Pages: 352
- Book Structure: Three parts comprising 37 chapters, narrated across three point-of-view perspectives: Callie, Annabelle, and Blair
Heather Book Summary (Spoilers Ahead)
Spoiler warning: This section reveals the complete plot, including the ending.
In the summer of 1990, seventeen-year-old identical twins Annabelle and Sabrina Riley live in a decaying colonial house bordering the New Jersey Pine Barrens. Their mother, Vera, has abandoned the family, and their father, Terry, is neglectful and absent.
Sabrina begins a secret affair with an older man driving a silver sedan whom she calls “The Coyote.” Curious and lonely, Annabelle gets into The Coyote’s car one afternoon and has a brief sexual encounter with him at a secluded blue hole sinkhole.
Annabelle later discovers she is pregnant. She seeks help at a crisis pregnancy center where volunteers shame her and refuse to assist with terminating the pregnancy. Meanwhile, Sabrina learns that The Coyote is actually Luke Caputo, an off-duty local police officer who boasts about exploiting underage girls.
Seeking money to escape their home, Sabrina confronts and attempts to blackmail Luke on March 1, 1991. Luke’s younger brother, Damien Caputo, intercepts Sabrina in a pickup truck to protect the family reputation. When Sabrina resists, Damien strangles her, strips her gold star charm necklace, and dumps her body into a seventy-foot-deep sinkhole.
In labor and isolated during a winter storm, Annabelle wanders into the woods and gives birth alone on the forest floor. In shock, she leaves her newborn wrapped in a towel by the side of the road, hoping headlights will find the baby.
Sixteen-year-old Jenna Barry discovers the infant while delivering newspapers. The baby dies of exposure and becomes the cold case known as “Baby Doe.” Devastated, Annabelle flees New Jersey, assumes the alias Iris Owens, settles in Cortlandt, New York, and marries Ben Owens.
In September 2023, Callie Hauser serves as the newly appointed Police Chief in Pine Lakes. She pulls over her estranged, alcoholic mother, Jenna, for a DUI. At the station, Callie overhears officers discussing how Jenna discovered Baby Doe in 1991.
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Callie retrieves the cold case file and notices a broken amber bead bracelet found near the infant’s body. Gary Hines, owner of the local bait shop, confirms the bracelet belonged to missing teenager Sabrina Riley.
Callie contacts cold case detective Benny Healey and genetic genealogist Rebecca Nixon to run DNA tests on Baby Doe’s preserved remains. Meanwhile, in Cortlandt, eighteen-year-old Blair Owens submits a commercial genetic testing kit to explore her mother Iris’s unspoken past.
The DNA results deliver two revelations. First, Baby Doe is a paternal half-sibling to Callie Hauser—meaning Luke Caputo fathered both Baby Doe through Annabelle and Callie through Jenna. Second, Blair’s genetic upload matches Baby Doe, identifying Iris Owens as Annabelle Riley.
Rebecca Nixon leaks the identification on TikTok, triggering a media frenzy that leads to Annabelle’s arrest in New York. As the truth unravels, Damien Caputo realizes Callie is closing in on the Caputo family’s crimes.
Damien lures Callie to a secluded sinkhole, knocks her unconscious, and prepares to drown her in the same water where he dumped Sabrina’s body. Before he can push her in, Callie’s best friend Jane—Damien’s wife—arrives carrying a hunting rifle.
Jane shoots Damien in the leg, saving Callie’s life as state police arrive. Divers recover Sabrina Riley’s body from the blue hole. Damien is arrested and confesses to murdering Sabrina.
Journalist Wren publishes “The Devil in the Pines,” exposing Luke Caputo’s decades of predatory abuse. Luke is arrested alongside nine victim testimonies. Annabelle accepts a plea deal for involuntary manslaughter, serving one year in prison and two years of probation.
Jenna gets sober and reconciles with Callie, moving to the family’s ancestral hunting cabin in Hauser Hollow. Callie resigns from the corrupt police department and chooses a new life grounded in her own truth and her relationship with Adrian.
Please See Us by Caitlin Mullen — The author’s Edgar Award-winning debut, also set in South Jersey, following missing women and systemic neglect in a fading casino town. Shares the same landscape and concern with overlooked victims. Sharp Objects by Gillian Flynn — A journalist returns to her small hometown to cover the murders of two young girls and confronts her own family’s dark history. Matches the gothic atmosphere, family secrets, and female-driven investigation. The Dry by Jane Harper — A federal agent returns to his drought-stricken rural hometown to investigate a family murder-suicide tied to a decades-old death. Shares the returning-protagonist structure, small-town dynamics, and cold-case framework. All the Dangerous Things by Stacy Willingham — A mother investigates the disappearance of her son while grappling with maternal guilt and childhood secrets. Overlaps in themes of motherhood, memory, and long-buried trauma. The Marsh King’s Daughter by Karen Dionne — A woman raised in isolation confronts the criminal legacy of her father after his escape from prison. Echoes the wilderness setting and the theme of ancestral violence shaping identity. Winter’s Bone by Daniel Woodrell — A teenage girl navigates a closed rural community to find her missing father, encountering poverty and criminal networks. Shares the landscape-as-character quality and the focus on vulnerable young women in insular communities. The Girls by Emma Cline — A woman reflects on her teenage involvement with a Manson-like cult, exploring how young women are drawn into dangerous situations. Connects through the themes of exploitation, memory, and the retrospective female gaze.
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