A question of identity

An old school photograph in which someone has been deliberately blacked out marks the start of a new case for Rona Parish. Who was this person and why would someone want to hide his or her identity? Rona sets out to uncover the secret and soon finds that the school in question closed down many years ago due, it was rumored, to a long-forgotten scandal. Could this be the link that will solve the mystery? Meanwhile, a visit to a stage hypnotist results in more than Rona and her friends bargained for . . .