This is a story set in 2050 when two sisters are forced to fend for themselves in a wilderness. 

The book begins with this message from the author: 'I believe we shape our world through the stories we tell about it - and if we continue telling dystopian tales of a climate-ravaged world, we'll probably get just that. What if we gave people - especially children - a vision to work towards?'

It's 25 years into the future and no humans are allowed in the Wildlands. This is a vast area in Britain which has been rewilded. Wolves, lynx and bison have been reintroduced and roam free.

Piercing the Wildlands, though, is the train route from London to Glasgow and two sisters are travelling to meet their mother who's speaking at a conference in Scotland.

When the train is forced to stop unexpectedly, 13-year-old Astrid and her little sister Indie find themselves beside the track and left behind. They're stranded in this wilderness with only limited supplies and a phone without signal.

Not knowing which way to turn they find themselves going further and further into the Wildlands, reliant on their ingenuity and determination to survive and seek help.

It's a brilliant concept for a book which the author dreamed up in 2019. 'Now rewilding doesn't seem so radical,' she says. But she was studying zoology at Cambridge and contrasting all she was taught about the management of land and wildlife with the theory of rewilding. This story, aimed at readers aged eight years upwards, seeks to make rewilding 'intentionally over-ambitious and breathtaking in scale,' she says.