Someone Killed His Boyfriend by David Stukas

When Michael Starks's groom-to-be vanishes with his Matisse painting and then is found murdered, all evidence points to a psychotic Bette Davis impersonator, and Michael and his assistant Robert, an underpaid copywriter for feminine hygiene products, and their strapping lesbian friend Monet must go undercover in a drag revue to trap a killer, in a delightfully riotous mystery. Easy-read beach-fiction. 
 
Second-hand harback copy in good condtion (a small section of inner fly-leaf is creased).