Four Jack-the-lads find themselves heavily - seriously heavily - in debt to an East End hard man and his enforcers after a crooked card game. Overhearing their neighbours in the next flat plotting to hold up a group of out-of-their-depth drug growers, our heros decide to stitch up the robbers in turn. In a way the confusion really starts when a pair of antique double-barrelled shotguns go missing in a completely different scam.

Frank Leone is nearing the end of his prison term for a relatively minor crime. Just before he is paroled, however, Warden Drumgoole takes charge. Drumgoole was assigned to a hell-hole prison after his administration was publicly humiliated by Leone, and has now arrived on the scene to ensure that Leone never sees the light of day.

M. Schuyler Towne is a competitive lockpicker and pioneer of the American Locksport movement.