Nigel Patrick is effective as a Scotland Yard chief inspector on the trail of a sophisticated gang responsible for a Whitechapel bank robbery. "Johnnoe" is getting close. His meticulous, no-nonsense, style of investigation is leading him close to Frank Finlay's "Sale" whom we know from the outset is a lynchpin in the criminal organisation. The criminals are no slouches, though, and they cleverly arrange to set-up the policeman and have him disgraced and suspended. Now it falls to his wife "Mary" (Katherine Woodville) and the brother of one of the gang's other victims "Ruskin" (Colin Blakely)…