5. Red Scare

Complete story — includes the ending

The CBI team is called to investigate the death of the wealthy new owner of the old Beckworth Mansion, which is the site where his murdered body was found. The victim and his wife bought the mansion with the hope of fixing it up, and the sentimental former owner developed a grudge. The local deputy sheriff, and other witnesses, believe that Walter Beckworth's ghost haunts the mansion and killed the new owner, so the investigation is accompanied by a discussion about the existence of ghosts. Jane discovers that the ghost was actually an illusion created by a system Beckworth built into the house to entertain his guests and also points out that the house is full of secret passages that the killer could have used. The CBI team and others, headed by Jane, then try to find a treasure supposedly hidden in the house, and come upon a riddle instead. The killer (the former owner's jealous nephew) is tricked into sneaking undetected into the mansion again in an attempt to locate the treasure, whereupon he is apprehended by the CBI upon arrival. Jane then reveals that he wrote the riddle himself. Van Pelt and Rigsby become closer during this episode, and finally express their feelings for one another.