Story of how American secret agent pursued by enemy agents, hides out at remote English farm

An estate agent arranges to meet a couple for a viewing at a flat.

A down-on-his-luck academic is called to the side of his ex-wife, who may or may not be suffering from a debilitating disease.

Meet Ellen Sheppard, an American living in Britain. Her English husband, Jason Sheppard, has been killed and she's under suspicion despite the appearance of a happy marriage. Jason's friend assists Ellen go over the facts to see if they can find the real killer.