The Secret Seven are always ready to solve a mystery in this much-loved series of 15 books by Enid Blyton, brilliantly illustrated by Tony Ross. .Solve the mystery with the Secret Seven – everyone’s favourite detective club! These timeless stories are perfect for young fans of mystery, adventure or detective series.In book twelve, there are strange happenings indeed at Torling Castle! Someone is hiding out in the ruined tower, making the resident jackdaws very unsettled. Who is it, and what do they want? The Secret Seven are on the case!Solve the mystery!