They call him the Wolfman - because he takes a nip out of his victims and because they found the first victim in the East End's lonely Wolf Street. But there's no urban predator that Rebus fears. When Scotland Yard are anxious to find the last serial killer on their patch they look north and soon Rebus is on his way south from the chill of Edinburgh to the rain of London. A serial killer from Dr Liza Frazer is attractive in more ways than one and Rebus is happy to take her up on her offer of help. But in taking on one ally who doesn't think that everyone achilles heel in the fight against the Wolfman.