War veteran Rick Dadier is one of three new teachers hired at North Manual High School, an inner city boys school. This is his first teaching assignment, which he needs to support himself and his insecure pregnant wife, Anne. Despite Principle Warnecke's assertions to the contrary, Dadier quickly learns that the rumors of student discipline problems at the school are indeed true.
There are plenty of guilty secrets at the school where Hildegarde Withers teaches. When she finds the body of the pretty music teacher, she calls in her old friend Inspector Piper, who promptly arrests the obvious suspect. Clues multiply and everyone looks suspicious as Piper and Miss Withers continue their battle of the sexes.