Pete Amsterdam, world's most reluctant private eye, is living the bachelor dream in Key West, Florida. Then his mother, the undaunted Gertie, shows up with her new hip, her large suitcase, and her gift for cutting remarks.

Penelope Calabro, world's most fetching pickleball instructor, has been managing to outrun her troubled, secret past. Until her Uncle Gianni appears one humid day with a mysterious hit-man following much too close for comfort.

Before long, Gertie has guilt-tripped Pete into taking on Gianni's very complicated problems, since Gianni is her last best hope for a scintillating late-life romance. But Pete has fallen for the irresistible Penelope...and run headfirst into a perplexing question: Who's the hit-man really after-the uncle or the niece?

With a midnight deadline to solve the puzzle looming, Pete finds himself with only the most improbable of allies-an ancient Mafioso named Bert the Shirt and his neurotic chihuahua, Nacho, along with a couple of ragged locals who live in an old food truck in the mangroves. Can this ill-assorted team beat the odds and save a couple of lives?

Told with Laurence Shames's trademark mix of comedy, suspense, and romance, Relative Humidity raises the temperature with crackling dialogue, steamy Key West atmosphere, and achingly on-point observations about the genetic accidents known as families.