Vanishing Act

On the edge: Level B Set 1 Book 3 

Things missing from the shops.
Computers smashed up.
Someone’s up to mischief on ‘Pier Parade’.

A mysterious red-head is under suspicion, but Jan sees a different side to her. Em’s not so sure, but agrees to help with some detective work. The problem is, what do you do when the main suspect keeps vanishing?