The Fourth Ruby

In this thrilling sequel to The Lost Property Office, Jack Buckles finds his life turned upside down a year after discovering the secretive Keep beneath Baker Street and his father's coma. With his tracker abilities faltering and tension with Gwen mounting, Jack is further plunged into chaos when they are wrongfully accused of stealing the cursed Black Prince’s Ruby. To clear their names and prevent a catastrophic threat from emerging, they must race against time to recover the remaining cursed jewels before the real culprit can unleash their power.