At the request of Bulstrode and Lacey, Jeff and Jeannie pose as doctors to investigate activities at a secret underground pain-research laboratory.

Jeff and Jeannie are hired to investigate what is happening at the home of an eccentric family. But so are their arch-rivals Marshall & Snellgrove, another firm of private detectives, who use the offices below theirs.

Jeff and Jeannie are hired to investigate the apparent suicide of a young gay man on the remote island of Strait Isle in Scotland, the inhabitants of which are starting to show some bizarre character traits. Their enquiries start at the brewery where the man worked.

Jeff and Jeannie are hired to investigate goings on at a hotel that is supposed to be haunted. Jeff has a disbelief in ghosts until Marty re-appears and gives Jeff back his memories of Marty being a ghost.

Jeff and Jeannie investigate an empty department store, where a crook's love of playing games has reached lethal extremes. But Jeff and Marty's relationship has reached such a nadir that Marty is cast adrift in Rhadamanthus-On-Sea.

Jeff's ex-fiancee Freya Cargill asks him to re-open investigations into the death of her Egyptologist father. Jeff and Jeannie head for the museum where he worked, and meet some of the strange staff who work there.

When the baby of their secretary Felia is kidnapped by the sinister Butranekh Cult, Jeff and Jeannie investigate some unpleasant goings on in Latvia.