The series concludes with Harry Ambrose finally finding a sense of peace. By solving Percy’s mystery, he confronts his own history of trauma and guilt, ending the show gazing at the Maine coastline, no longer haunted by the ghosts of his cases.

It is confirmed that Percy's death in the first episode was indeed a suicide. The crushing guilt of killing Bo, combined with her family's toxic silence and their involvement in a larger smuggling ring to maintain their power, led her to leap from the cliff.

Ambrose discovers that two years prior, Percy Muldoon accidentally shot and killed Bo Lam during a heated confrontation on a boat.