Weighed down by grief and guilt, DCI Tom Mathias comes to coastal Aberystwyth after a decade on the London police force. Escaping recent hurts and long-simmering trauma, he's on a journey of recovery, healing himself by bringing justice to others. But the beautiful seaside vistas and close-knit mountain villages hide a multitude of sins. Partnered with hardworking local DI Mared Rhys, Mathias confronts mystifying murders that push him to the edge in a place with secrets as dark and destructive as his own.