A car plunging over a cliff kills its two occupants identified as newspaperman Lewis Forrester and actress Alison Ford (Terry Moore). Surviving Lewis are his two brothers, Tim (Robert Beatty), a portrait painter, and Dave (William Sylvester), a pilot. Scotland Yard discovers that Lewis' death was engineered by a gang of international diamond smugglers he was about to expose. Before he died, he had sent someone in London a post card with a sketch of a woman's hand holding a Chianti bottle. Alison's father, John Smith (Henry Oscar) commissions Tim to paint her portrait from a photograph. While Tim is out, the supposedly-dead Alison enters his studio, but flees when she finds the body of Jill Stewart (Josephine Griffin), Tim's favorite model. Scotland Yard Inspector Colby (Geoffrey Kene) suspects Tim because whatever alibi evidence Tim presents vanishes before the Inspector can confirm it. Reg Dorking (William Lucas), a used-car dealer tries to blackmail Tim, offering the post card sent ...
