'Mr. Mac', as Sherlock Holmes calls him, is the talented young Inspector Alec MacDonald. Though he's out to make his mark at Scotland Yard, some baffling new cases have him seeking assistance from the great detective; and the two, along with the stalwart Doctor Watson, join forces. In THE AFFAIR OF LADY WESTCOTT'S LOST RUBY, the seemingly mundane disappearance of an elderly lady's pet leads to unexpectedly sinister consequences, while in THE UNSEEN ASSASSIN, a mysterious marksman embarks upon a serial killing spree across London.