Elliott Smith wakes up in the hospital with a head injury...and an invisible companion. At first, he's convinced "John" is just a figment of a damaged brain, but when Elliott is fully recovered John is still around—and desperate to find out who he is. Reluctantly, Elliott agrees to help, and discovers Chicago PD has a John Doe on their hands with six bullets in him—who died in the ER at the same time Elliott was there. As Elliott digs deeper into the mystery of John, he stumbles on a body hidden behind a wall for 80 years, meets a sexy artist who could become more than just a one-night stand, and uncovers a deadly secret that has haunted a nun for two decades.