Ken is approached by Marion Kershaw who is looking for her missing husband, Geoff, who is in ""the import/export business"". Ken soon discovers that Geoff Kershaw owes money to the taxman. At the squash court that Kershaw uses, Ken finds a holdall containing a large amount of cash, a false passport and a gun.

The police tell him that Kershaw is wanted for running an antiques smuggling business, stealing antiques around the country and sending them abroad. Ken and Harry agree to stage a fake robbery at Woodcote Park so as to have some ""stolen"" antiques with which to tempt the smugglers. The local contact for them turns out to be Eric Beveridge, an antiques dealer who has just sold Helen some chairs for Woodcote Park.

Geoff and Marion meet up at a deserted quarry - the ""missing person"" story is evidently a cover. With Harry and the police tailing them, Beveridge takes Ken to the quarry where Marion recognises Ken. After a dramatic chase, Beveridge and the Kershaws are arrested. Helen catch