Nineteen-year-old Portia Adams has always been inquisitive. There's nothing she likes better than working her way through a mystery. When her mother dies, Portia puzzles over why she was left in the care of the extravagant Mrs. Jones but doesn't have long to dwell on it before she is promptly whisked from Toronto to London by her new guardian. Once there Portia discovers that she has inherited 221 Baker Street --the former offices of Sherlock Holmes and Dr. Watson. Portia settles into her new home and gets to know her downstairs tenants, including the handsome and charming Brian Dawes. She also finds herself entangled in three cases: the first involving stolen jewelry, the second a sick judge and the final case revolving around a kidnapped child. But the greatest mystery of all is her own. How did she come to inherit this townhouse? And why did her mother keep her heritage from her? Portia has a feeling Mrs. Jones knows more than she is letting on. In fact, she thinks her new guardian may be the biggest clue of all.