Under My Skin — Sarah Dunant

In Under My Skin, private investigator Hannah Wolfe's cushy new assignment takes her to the sumptuous Castle Dean health spa. While being plucked, crimped, steamed, and oiled, Hannah is ideally placed to probe some reported cases of sabotage -- fish in the Jacuzzi and steel nails in the massage heads. But spa owner Olivia Marchant has other problems besides sabotage. Someone is threatening her husband, Maurice, one of London's leading cosmetic surgeons and the man responsible for reconstructing many of the world's rich and famous. In a culture where no one wants to grow old and everyone seems to believe in the power of the knife, Hannah feels like an alien visitor. People will do anything in the name of beauty -- perhaps even commit murder.