As a journalist for a New York City paper, Felicity Staples knows she must research Madison May's shocking murder, but the crime seems random and the suspect is in the wind. That is, until Felicity spots the killer on the subway, right before he vanishes. Soon, Felicity senses her entire universe has shifted. Felicity realizes that in her pursuit of Madison's killer, she followed him into a different dimension - one where everything about her existence is slightly altered. At first, she is determined to return to the reality she knows, but when Madison May in this world is murdered, Felicity decides she must find the killer.