The Amber Effect — Richard S. Prather

Just when surefire shamus Shell Scott was thinking that unannounced naked women don't show up on his doorstep frequently enough, a Ms. Naked USA contestant and next-door neighbor comes knocking with nothing on. But the real knockout is her story: someone tried to kill her and is now dead on her floor! This private eye can't believe what he's seeing! Before Scott can even ask where she kept the weapon, she's disappeared and our private dick is stuck with the stiff?