When Archie Wiggins is kicked out of the Baker Street Irregulars, the gang of urchins that assists famous detective Sherlock Holmes, he has no idea what to do next. But then Holmes himself goes missing--and it seems the Irregulars might have had something to do with it. Now Wiggins and a few other misfits must take matters into their own hands.

Along the way the misfits uncover two murders and a spectacular plot aimed at the very heart of the British Empire--and when the adventure is over, they find they're misfits no longer, but part of a new team: the Raven League!