Evildoers beware! Retribution is at hand, thanks to Britain's best-kept secret agents!! Certainly no strangers to peculiar occurrences, agents Wellington Books and Eliza Braun are nonetheless stunned to observe a fellow passenger aboard Britain's latest hypersteam train suddenly vanish in a dazzling bolt of lightning. They soon discover this is not the only such disappearance . . . with each case going inexplicably unexamined by the Crown. The fate of England is once again in the hands of an ingenious archivist paired with a beautiful, fearless lady of adventure. And though their foe be fiendishly clever, so then is Mr. Books . . . and Miss Braun still has a number of useful and unusual devices hidden beneath her petticoats.