1361. Plague has returned to England – thirteen years after the devastation of The Black Death.
As destruction advances towards his estate in Kent, Oswald de Lacy leads his family to the safety of a remote castle in the marshes – where his friend Godfrey is preparing a fortress to survive the coming disaster.
The rules are clear: once the de Lacys and other guests are inside the castle the portcullis will be lowered and no-one permitted to enter or leave until the Pestilence has passed.
And then a murderer strikes.
Oswald is confronted with a stark choice – leave and face the ravages of the plague, or stay and place his family at the mercy of a brutal killer. With word of his skills as an investigator preceding him, it falls to Oswald to unmask the murderer in their midst.
Host, guest, or servant – everyone is a suspect in this poisoned refuge of secrets, deceit and malice.