Conrad Mac Dowell felt it: The spirit wants to convey a new message. Did the psychics make a mistake? The presence of additional suspects in the villa calls their conclusions about the spirit's death into question. Mysterium returns with its first expansion: Hidden Signs. With its six characters, six locations, and six items, it allows for completely new game configurations. The spirit has 42 additional vision cards at its disposal to communicate. Step in, your seat is waiting for you...