Bastard son Arthur returns to the land he's been banished from to find a kingdom in chaos. Seeking the aid of his oldest confidants, Arthur aims to right Britain's path as he faces the most unexpected of obstacles.

Now a detective-for-hire like her infamous brother, Enola Holmes takes on her first official case to find a missing girl, as the sparks of a dangerous conspiracy ignite a mystery that requires the help of friends — and Sherlock himself — to unravel.