It is 2055. Floods have devastated London, on the eve of the First Space War. Mathew Erlang is confined to his house with only his cat, his robot and his holographic dragons for company. When he finds himself trapped in his neighbour's house, he opens a door, falls 400 years into the future and starts to destabilise the course of human history. Mathew Erlang's mother is dying. He's the only one who can save her. Thirty-five years in the future. When Mathew Erlang's mother, Hoshi, becomes seriously ill, he'll do anything he can to save her. He knows his future self would too. Breaking into the house next door, the one belonging to his peculiar neighbour, August Lestrange, he activates his holographic games room, which doubles as a time machine, to hack into his own future. Alone in an England afflicted by extreme weather, biological warfare and civil war, Mathew needs to find his older self before Lestrange catches up with him and takes him back to his own time.