Harrow-on-the-Hill, March 1836: Orphans Ollie, John, and Arthur have gone from a hardscrabble life scavenging the banks of the Thames for bits and bobs to becoming students at a boarding school outside of London, thanks to the generosity of Charles Dickens. But now they're missing—as is, apparently, a treasure map. Now Charles and his fiancée Kate Hogarth must artfully dodge false leads and red herrings to find the boys and the map—before it's too late.