The night before their high school graduation, Jessie and her friends are guided by a 'Find My iPhone' app to recover her lost device from a house whose demented tenants are hell bent on making her a flesh and blood member of the family.

When the ultimate prank sends their principal under water, it's up to Everett, Alyssa and Riley to put their super detective skills to the test, catch the perp, and save their school's first dance in 40 years.