Rosemary and Laura are called to Stagford Lodge Prep School to investigate the case of the newly planted roses dying, as well as extending the already planted rose garden. Whilst investigating the problem the duo are invited by Mr Oakley the classics teacher to dine at the masters table on 'the night of the stag' when the school boys play a practical joke on one of the masters. The night goes horribly awry and two teacher are attacked. Despite the events Rosemary and Laura begin to suspect there is even more trouble to come and their suspicions are proved when they discover the body of Simon Todd, the geography master buried in the grounds...