When Hobart Penny is found dead in his apartment, the cops think that his pet cat--an adult female tiger--attacked the reclusive elderly billionaire. But it soon becomes clear that the beast that killed the eccentric inventor is all too human. Digging into the victim's life, Decker and his colleagues, Detectives Marge Dunn and Scott Oliver, discover that Penny was an exceptionally peculiar man with exotic tastes, including kinky sex with call girls.