Set in the divided town of Littleport, Maine, 'The Last House Guest' is a riveting thriller that centers on the bond between Avery Greer, a local resident, and Sadie Loman, a vacationer from a wealthy family. When Sadie's death, ruled a suicide, casts a shadow over Avery, she becomes determined to clear her name. As she delves into the truth behind Sadie's death, Avery confronts a web of hidden agendas and secret relationships that could cost her more than her reputation.