When Alf Jarrett spots the hitch-hiker waiting on the motorway slip-road, he thinks his prayers have been answered. William Banks is a personable young man of twenty, just leaving home for the first time – perfect for what Alf has in mind.

          And when William is offered a free night’s lodgings and the chance to repay Alf for the lift, he accepts eagerly. After all, it sounds simple enough – drop off a package at a block of flats and post the spare key through the letter-box.

          What William doesn’t realize is that he is the intended victim in a sinister plan of arson and murder. And it is only his good fortune – and the timely intervention of a guardian angel in the form of a charming girl called Calli – that saves him from becoming a corpse …..

          Thrown involuntarily into a case that involves mistaken identity and a bank robbery from which the spoils have never been recovered, the two young sleuths discover they aren’t the only ones on the trail….. And there is another murder and a dramatic confrontation before the tangled threads are finally unravelled.