Dirk Dynamo is glad to be back in civilisation, with two clues to the location of the Great Library. But when ninjas kidnap his friend and steal a priceless artefact, Dirk is forced to pursue them into the sewers below London. Faced with deadly assassins and the strange followers of the Underlord, can Dirk save Sir Timothy and the tablet before he ends up on the wrong end of a shuriken?
