Trying to sort out a marriage problem may be nothing to do with Air Security, but Garnett finds himself acting as a marriage broker when he is faced with a formidable Greek family with two unmarried sons, and a pretty girl who has come all the way from New York to marry one of them.

When Archy Vance, released from a United States prison, flies to London, he is recognized at the airport by Garnett, who puts Delaney on trial. Delaney soon finds himself deeply involved in a robbery which is as startling as it is audacious.