On a cold and rainy night, a security guard at a gravel quarry encounters a woman trespasser who appears to be lost and confused. She does not respond to verbal commands, and utters a series of nonsensical words when questioned. Police chalk it up to mental illness or drugs... until two other people show up at the same quarry days apart. The others also appear to be dazed and disoriented, and repeat a strange combination of words. None of the three trespassers know each other, and there are no apparent connections between them. Police Chief Bradley Alden suspects something troubling, so he calls on Mary O’Reilly to investigate potential paranormal aspects of the case. Mary teams up with a new detective, Penny Abrams, who is investigating a crime at the quarry. Mary and Penny begin to unravel a story that leaves them in shock when the source of the strange occurrences are finally revealed.