In Agatha Christie’s THEY ARE DOING It with Mirrors, the indomitable Miss Marple investigates some rather lethal doings at a treatment middle for delinquents.

Miss Marple senses danger when she visits a friend surviving in Stoneygates, a rehabilitation middle for delinquents. Her concerns are verified when somebody shoots on the administrator. Although he is not harmed, a secret visitor is much less fortunate-shot dead concurrently in another part of the building.

Pure coincidence? Miss Marple believes not, and must use all her cunning to resolve the riddle from the stranger’s check out … and his murder.