Mateo is finally old enough to join in on the Morrison family prank war. As the youngest witch in the family, he has a lot to prove. But Mom, Dad, and Nina are all determined to win as well. Mateo comes up with what he's sure is the winning prank--truth serum for his sister. But when the spell puts the family secret in jeopardy, everyone is at risk. It will take the siblings working together to keep things under wraps.