Spoilers:

The sequel to Beneath the Mask of Sanity, Beyond the Mask begins ten years after Bentley's murders. Bentley is being released from the mental institution and almost immediately the murders begin again. Sheriff Frank Miles is in the unfortunate position of Bentley's alias (Bentley was with him during the first murder) and knows Bentley didn't commit the crime. When Bentley asks to lend his unique insight to the case, Frank is hesitant. Yet, he knows that he would work with the Devil himself to solve a crime. Bentley and Frank follow the killer's trail, trying to keep up before they are the next victims.