The Saint Meets His Match — Leslie Charteris

Simon Templar is The Saint daring, dazzling, and just a little disreputable. On the side of the law, but standing outside it, he dispenses his own brand of justice one criminal at a time.

Simon Templar finds himself on the side of the righteous for once when he agrees to work with the police. They're after the gang known as the Angels of Doom, who specialize in abetting convicted criminals escape. But Templar finds a kindred spirit in Jill Trelawney, the mastermind behind the gang, and Scotland Yard soon learn that you can't hire a Saint and hope to have things all your own way....