"Slim Callaghan" (Michael Rennie) is a PI with an habit of solving crimes using such unconventional methods as to annoy the police almost as much as he does the criminals. When a young woman drugs his Scotch at a night club, just as a would-be client tries to call him; then that same gent shakes off his mortal coil very shortly afterwards, his interest is well and truly piqued. Despite the protestations of one of the deceased man's three daughters, he heads to their home to investigate. Moira Lister, Faith Brook and Patricia Goddard play the daughters trying to manipulate the old man's will…