Water hazard

Borg's first novel is written in the suspenseful tradition of Alfred Hitchcock. Anderson, approached in a bar by a stranger, is drugged and kidnapped. He awakens as someone is drowning him; to his horror, his assailant, a man named Peterson, looks as if he could be his twin. Anderson bests Peterson and drowns him. He then discovers that his wallet has been switched with Peterson's and that the police believe that it is Anderson who has drowned. He goes to Peterson's opulent home, where he finds several envelopes full of money. The police arrive to question "Peterson" about "Anderson's"…