Secret Seven: Mystery of the Theatre Ghost (Book 18 in The Secret Seven Series)

The Secret Seven are excited to be chosen as extras in a local play, but during the opening performances things go seriously wrong. Could someone be trying to sabotage? The cast and crew are adamant that a theatre ghost must be causing the mysterious accidents, but the Seven aren't convinced. It's up to the gang and their spaniel Scamper to find out who is really behind the mischief - and why!