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Planner' Preston, a lifetime of successful robberies behind him, is organising a heist against a wages van, ill-guarded and with a predictable route. After hiring the necessary manpower and allowing for every contingency, Planner sets a date. Then one of his team learns that the route has lengthened and the guard has been doubled. Against his instincts, but goaded by the young recruits who think he has become timid in his old age, Planner agrees to go ahead - even though he knows the risks.

Harpur and Iles always suspect Preston is planning something and view even a visit to the dentist as cause for speculation. Now, the increase in activity surrounding Planner's associates begins to turn their detective antennae firmly in his direction.