The murder of a rare bookseller brings Jane and Maura into the world of Keltic writings and coded confessions, just as Maura is preparing Jane to meet her new man. Angela's relationship with Cavanaugh changes pace.

Mummified remains of a woman put the team's investigative skills to the test. Jane works from her hospital room as she, with Maura's and her family's support, seeks to recover from a devastating loss.