Jonah takes Maren out on the Lily Rose. They share vulnerabilities about trauma and isolation. They visit Ruth Danvers at her lighthouse cottage where Ruth confirms Judge Cairn sexually abused Lily while she was his employee.
Maren and Jonah investigate Lily's disappearance. They learn Lily was pregnant and researching the Cairn family while working for Judge Cairn in summer 1995. Ruth Danvers reveals Lily gathered evidence of abuse. Maren tours the Cairn estate and detects sealed rooms and hidden structures.
Funding for the restoration project is suspended by the Historical Preservation Foundation under pressure from the Cairn family, forcing Maren to confront a choice: leave or fight. She decides to stay and find alternative funding. Maren's sister Sloane expresses concern but supports her decision.
News of the reopened murder investigation spreads through Bitter Harbor. Jonah confronts Nathaniel Cairn at the bar, revealing the state police investigation and his willingness to pursue truth. Maren finds Jonah at his boat and confesses her feelings, leading to their first kiss.
DNA results confirm the bones belong to Lily Vance, confirming Jonah's thirty-year search was justified. Cause of death: blunt force trauma. The case reopens as a murder investigation.
Maren searches town records but finds no permits for the sealed wall, discovering instead that renovations were done off-the-books. The nursery contains evidence of a baby born to Sara Blackwell in 1994 with an unknown father, sponsored by Judge Cairn.
Vandalism at the manor forces Maren to confront local resistance to the investigation. She discovers a mysterious sealed wall in the east wing that suggests hidden secrets. With Jonah's support, she determines to uncover what lies behind it.
Maren and Jonah return to the manor for restoration work and conversation. They share personal details: Maren's failed engagement and search for meaning, Jonah's salvage work and lifelong obsession.
Maren approaches Pete Callahan for information about Annie Wren's hidden reading spot. Pete confirms there is a cave along the cliffs where Annie used to hide, likely where she stashed the documents mentioned in her letter. Pete agrees to guide them to the cave. The three forge an alliance.
Maren and Jonah break into a sealed room at the manor and discover Judge Cairn's private office. They find damning evidence: Lily's employment file showing she was fired June 12, Annie's threatening letter to Judge Cairn, and an original police report documenting the teenagers' visit to the...
Jonah reveals thirty years of investigation into his sister's disappearance. He explains how Lily changed after working for Judge Cairn, and how the official investigation concluded she was a runaway. Jonah shares his meticulous evidence collection and connects Maren to his quest for truth.
Maren receives pressure from the historical society to back off the investigation. The town actively works to obstruct her work through permit delays and social pressure. She discovers a threatening anonymous note at her inn, escalating the danger.
