18 September 8.40 am
12-year-old Rebecca Riverton was looking forward to her camping trip. Instead she finds herself alone at the stables, with only her horse Flock for company.
Having lost everything except her backpack and sleeping bag, she rides east, hoping to find other survivors in London.
Straying too far south, she finds a home and friends at Hever Castle, where she forges a new future for herself as she gains the respect of both humans and aliens.
In her diary, Rebecca describes her emotions and adventures as she adapts and flourishes in a new world where prejudices and stereotypes of the past have disappeared.