Big Trouble by Dave Barry
In the city of Coconut Grove, Florida, these things happen: A struggling adman named Eliot Arnold drives home from a meeting with the Client From Hell. His teenage son, Matt, fills a Squirtmaster 9000 for his turn at a high school game called Killer. Matt's intended victim, Jenny Herk, sits down in front of the TV with her mom for what she hopes will be a peaceful evening for once. Jenny's alcoholic and secretly embezzling stepfather, Arthur, emerges from the maid's room, angry at being rebuffed. Henry and Leonard, two hit men from New Jersey, pull up to the Herks' house for a real game of Killer, Arthur's embezzlement apparently not having been quite so secret to his employers after all. And a homeless man named Puggy settles down for the night in a treehouse just inside the Herks' yard.
In a few minutes, a chain of events that will change the lives of each and every one of them will begin, and will leave some of them wiser, some of them deader, and some of them definitely looking for a new line of work. With a wicked wit, razor-sharp observations, rich characters, and a plot with more twists than the Inland Waterway, Dave Barry makes his debut a complete and utter triumph.