With unfinished business to attend to the Seventh Doctor returns to where it all began: Coal Hill School in London in 1963. Last time he was here the Doctor left something behind
- a powerful Time Lord artefact that could unlock the secrets of time travel. Can the Doctor retrieve it before two rival factions of Daleks track it down? & even if he can how will the Doctor prevent the whole of London becoming a war zone as the Daleks meet in explosive confrontation?