Tennis Term at Trebizon by Anne Digby

'I'm perfectly certain that Rebecca is a Hoaxer...'
 
Rebecca's summer term is shaping up to be a very happy one. She's been picked for the first tennis team and Trebizon has high hopes of winning the cup. But then there's a hoax phone call and a fake fire alarm and Rebecca finds herself under suspicion.
 
If Rebecca and her friends can't solve the mystery, there will be serious consequences.