The following is a brief, official synopsis. For a detailed account of the episode, click here.

September 1940: As Andrew Foyle takes to the skies for dangerous sorties over Germany, Sam goes undercover at a fuel depot to track down the culprits behind an illicit fuel racket. But just as Sam is about to point the finger at Connie, another driver, the girl is found dead. Sexual indiscretions and racketeering - plus links to Andrew - combine to make this a delicate case for Foyle.

When Foyle and Sam are shot at and almost run over by a speeding vehicle, they inadvertently uncover an illicit fuel racket. In an attempt to track down the culprits, Sam eagerly goes undercover at the local fuel depot run by Michael Bennett, using her mechanical training to pose as a newly recruited tanker driver.

Making friends with another female driver, Connie, Sam is introduced to a whirl of dances, make-up and men. Sam is surprised when she discovers that one of the young men in Connie's little group is Foyle's son, Andrew. Alongside his best friend Rex, Andrew is now an active pilot and does regular scrambles over to Germany.



Soon Sam thinks she's discovered the source of the petroleum thievery: Connie. But before anything can be done, Connie is discovered - dead.

As Foyle sets out to uncover the reasons for her demise, he must untangle not only a complex crime network of racketeering and illicit fuel trading, but also an intricate interpersonal network of sexual indiscretion, illegitimate pregnancy and homosexuality.

There are even some suggestions that Andrew himself may be involved in Connie's murder. Of course, Foyle trusts that his son is innocent - but how can he help him if Andrew refuses to tell the truth?