A prank gone wrong by Chinese exchange student Xi Zhōu (12) throws Lucas (12) and his family's everyday life into chaos. A pizza box full of money that has been mixed up not only attracts a gang of gangster rappers led by the famous Miss Nelly, but also the real mafia and a clumsy pair of police officers. The crazy adventure draws the two unlikely boys into a whirlwind of fast-paced, increasingly dangerous events. Together with his crush Charly (Charlotte) and Xi, Lucas tries to untangle the chaos. It quickly becomes clear that to get rid of the spirits they have summoned, they need one last, ingenious PRANK.