Miskatonic Valley holds many mysteries - cultists worshipping old gods, a doctor deadset on resurrecting the recently deceased, a house overrun by rats in the walls - but none more recent than a series of bombings targeting the Valley's elite.

These horrors reach a breaking point when the brilliant, hard-nosed investigator Miranda Keller is sent to stop the bombings. To J. Edgar Hoover, there can be no other explanation than those responsible for similar actions during the Red Scare of the 1920s...but when Miranda digs too deep, she uncovers an unimaginable occult conspiracy, one that may cost Miranda her job - and her sanity.