1944. As life in Britain's cities becomes increasingly perilous, 3 evacuee children – Lily (Beau Gadsdon), Pattie (Eden Hamilton), Ted (Zac Cudby) Watts – are sent by their mother from Salford to the Yorkshire village of Oakworth. There to meet them on the station platform are Bobbie Waterbury (Jenny Agutter, reprising her iconic role in the original film), her daughter, Annie (Sheridan Smith) & grandson Thomas (Austin Haynes), and with their help the evacuees are soon settling into their new life in the countryside. When the children discover the injured American soldier Abe (KJ Aikens) hiding out in the railyard at Oakworth Station, they are thrust into a dangerous quest to assist their new friend who, like them, is a long way from home.