During the reading to his students, the physicist and chemist Dr. Peter Wehller was informed that his wife was killed in a car accident. The police closed the case, but for Peter, there were a lot of discrepancies in this accidental death! Why was his wife in the passenger seat when there was no one else in the car? And why did she have a puncture mark on the side of her neck? In order to find out what happened in this accident, he dug out the “Research into the Past” project from his ideas drawer. But the trip into the past brought a surprise. The perpetrator himself came from the future. Can Peter stop the murderer to save his wife without changing contemporary history? Or has it already been changed by the murderer?