Jack Havoc, jail-breaker and knife artist, is on the loose on the streets of London once again. In the faded squares of shabby houses, in the furtive alleys and darkened pubs, the word is out that the Tiger is back in town, more vicious and cunning than ever. It falls to Albert Campion to pit his wits against the killer and hunt him down through the city's November smog before it is too late.