Lock Nut - The Plumber's Mate Mysteries, #5

Still waters run deadly.... Tom Paretski, plumber with a talent for finding hidden things, and his private investigator fiancé Phil Morrison have been hired to locate a runaway husband, Jonathan Parrot. The job seems simple enough-until their quarry turns up dead in a canal, and a photofit of Tom's face is splashed all over the news, making him chief suspect. The widow, petite ex-porn star Lilah Lovett, is convinced her husband was killed by his gay lover, but Tom and Phil aren't so sure.
Worried they may have precipitated Jonathan's death, they're determined to find the real killer. But with a web of incestuous ties linking the suspects, it's hard to know who to trust. Especially when a second victim dies a gruesome death. Meanwhile, with their wedding looming and them sharing a house now, Tom's worried it may all be too much, too fast. The last thing he needs are the mixed messages Phil seems to be sending out.
They'll need to get back on the same track if they want to make it to their honeymoon together-and alive.