A performance artist is due to come to school. A pensioner, Frank Hooper, arrives with some enthusiasm to use the computer facilities of the CLC: Alison and Sammy are convinced he is the artiste and start drawing him. The true performer, Mr. McGuffin, makes himself known to Mr. McDonnell – he is dressed as a policeman and sets up a mystery for the Year 7's to solve, aided by Tigger and Ed. Unfortunately, the boys have real life problems – their mobile phones are stolen from their bags. Tigger's immediate thought is to blame Chloe, who in turn has seen the fake policeman and is concerned her many crimes have been found out.