The date is March 14, Pi Day, whereon a serial killer is on the loose in the fictional small Ohio town of Euclid Falls. The students of Euclid High fear for their lives as their classmates disappear, falling victim to this elusive murderer. With the help of Euclid High's math teacher, Mr. Douglas, Detectives Mahoney and Beecher find clues to solve this circle of bloodshed.