Katherine Rundell

Left stranded in the Amazon jungle when their plane crashes on their way back to England from Manaus, Brazil, four children struggle to survive for days until one of them finds a map that leads them to a ruined city and a secret hidden among the vines.

In the days before the Russian Revolution, twelve-year-old Feodora sets out to rescue her mother when the Tsar's Imperial Army imprisons her for teaching tamed wolves to fend for themselves.