Three's A Crowd, PPB

What happens to Chip, Bud and Rudy in Las Vegas does not stay in Vegas. It travels all the way to Paris and ends in murder.

Three nerdy conventioneers are so consumed by sexual fantasy in their annual pilgrimage to a North Vegas strip club, the Tough Titty, that they hatch a plot to rid themselves of their wives, luring them to the City of Light and killing them all on the same bloody night.

Their best-laid plans devolve into dark comedy when Chip, their most organized member, commits a disorganized murder on a dark island in the Seine — where they all convene to make sure that Judy is dead.