The world may slowly be coming to an end, but for Billie and Spike it's just the beginning. Sent into space to explore the Blue Planet - a strange but habitable new world where leaves are as big as cities, birds nest in shells and humanity could have a second chance - they start to fall in love. But what will they discover when in their newfound land? As they whirl into the future, through new lifetimes, different identities and dazzling stories, will they ever truly find a home?