Nineteen year old US exchange student Patricia Groves goes missing on a visit to the Sherlock Holmes Museum in London. Her family are distraught, but Scotland Yard are strangely reluctant to investigate. Ella Doyle interrupts her work on a memoir of Arthur Conan Doyle’s role in her own family history and teams up with John Mason, a brilliant security consultant, to solve the mystery. At first, it seems like a 21st century version of a Sherlock Holmes locked room mystery. But nothing in this story is quite what it seems.