Detentionaire Episode 19 Mastermind Episode Title:Mastermind.Episode Description:Lee gets his spot in detention replaced when Tina's sister Ruby takes the blame for the prank. Tina investigates whether she is involved in the prank or used by Lee (in her words). Ruby confesses to Tina and Lee that she wasn't involved in the prank and wanted detention so she can't go to university. Lee is then given detention back. Lee charges Radcircle's phone, he can't wait to use it to find out who he is. The episode ends with Lee leaving his room for dinner and Radcircle's phone being fully charged and is locked.