In one of his loops, Castleman learns of a local physicist's theory that appears to describe his situation. The physicist, Nathan Rosenbluth, theorized a "disfiguration of time" that could cause the universe to snap backward and repeat the period of one hour. Over his next three time-loops, Castleman tries desperately to contact Rosenbluth and ask him for advice.
Castleman encounters a local physicist named Rosenbluth who proposes a theory about time's disruption, which might explain his situation.  Over the course of three time loops, Castleman tries to reach out to Rosenbluth for guidance.