A brilliant but idiosyncratic British detective and his resourceful local team solve baffling murder mysteries on the fictional Caribbean island of Saint Marie.

Bert and Sam have been living in Spain for the last few years, Sam in the rolling hills and Bert in the slightly less idyllic setting of a prison cell. After a decade behind bars, a cancer diagnosis allows Bert to walk free on compassionate discharge. With only a few weeks to live, she resolves to take on a multi-million-pound art heist that will test her mettle, and prove her worth. Sam reluctantly lets Bert back into her life, and quickly finds herself returning to the life of crime she's tried to leave behind.

Jacob, a man who believes he is a wolf trapped in a human body, is sent to a clinic by his family where he is forced to undergo increasingly extreme forms of "curative" therapies at the hands of The Zookeeper. Jacob’s only solace is the enigmatic Wildcat, with whom he roams the hospital in the dead of night. The two form an improbable friendship that develops into infatuation.