They Do It With Mirrors (Miss Marple Mysteries)

<p> Miss Marple senses danger when she visits a friend living in Stoneygates, a rehabilitation center for delinquents. Her fears are confirmed when someone shoots at the administrator. Although he is not injured, a mysterious visitor is less fortunate--shot dead simultaneously in another part of the building. </p>\n<p> Pure coincidence? Miss Marple thinks not, and must use all her cunning to solve the riddle of the stranger's visit ... and his murder.</p>