London's darkest hour. Becky & Flynn's brightest moment. In the winter of 1915, the spirit of Christmas is overshadowed by the nightmare of the Great War. But within England's desperate ordeal, Becky and Flynn discover an unexpected depth to their bond, a strength that will be their beacon through the trials ahead. Their personal world rapidly plunges into crisis. Flynn, alongside the legendary Sherlock Holmes, falls into enemy hands; Mycroft Holmes...