Emery’s clumsy and monumentally unlucky cousin Leon is coming to visit for a whole week! Philip and Emery, best friends, are desperate to find ways to keep Leon out of their way, but Leon’s bad luck—and disaster—follows them everywhere. Rabbits’ feet don’t work. Homemade remedies don’t work. And when Emery and Philip have an extraordinary spell of bad luck themselves, they’re certain that Leon’s bad luck is contagious. They plot and plan to convince Leon that the safest place for him is in his own home.
In a panic, Leon gets his mother to end his visit early but promises to return for a night a week from Friday, when he hopes he’ll be over his bad luck. Triumphant, Philip and Emery laughingly decide to circle that unlucky date on Emery’s calendar, but when they do they get a shock. The thirteenth of the month. Friday the thirteenth! And they have to spend it with Leon!