Rachel is still getting used to the idea of Mycroft being her boyfriend when he disappears to London with Professor Walsh. They're investigating the carjacking death of the rare books conservator, which appears to be linked to the theft of a Shakespeare First Folio from the Bodleian Library. Worried about similarities between the conservator's accident and the death of Mycroft's own parents, Rachel follows Mycroft to London ...and straight into a whole storm of trouble.