Lane Brain: Detective Brain retired from Scotland Yard due to a rare sleep disorder. However the yard does not hesitate to call on Detective Brain for help with some of their most difficult cases. Lane Brain stands six foot seven inches tall, and although in his mid fifties, is still a formidable figure for any criminal to face.
John Leesburg: A professor of Criminology currently teaching at Cambridge University. He is often called upon by Scotland Yard to assist in solving cases of a more Bizarre nature. he is a good friend of Detective Brain, and they often collaborate on some of the more difficult cases.
Anderson Catwell: A 42 year old Inspector and Chief Investigator for Scotland Yard's homicide division. Inspector Catwell is a veteran of the British Army, and a friend of John Leesburg's.
Daphne Knight: One of the first women working in a fairly new field called Psychiatry. She has also studied Hypnotism, considering it more than just a circus sideshow trick. Dr. Knight is also an acquaintance of John Leesburg, and has been called upon to assist him in some of his Scotland Yard cases.