Phyllis Clark and the Demon's Cult

In the fourth book of the series Phyllis is back in California visiting her Uncle Henry and Benjamin when the Devil's Scepter is stolen from Uncle Henry's museum. Philip Clark is hired by the insurance company to recover it. Once he arrives in southern California the bodies begin to pile up and the chase is on as they consider rival demonic cults as their suspects. This is the third book in the series related to the Phyllis Clark and the Devil's Scepter.