The Time Travels of Arabella and Tom: The Evacuees

Arabella Twigg is a very ordinary girl, living in an extremely peculiar family. She is the sort of girl that no-one notices but somehow strange things begin to happen to her.
When her class was learning about the Second World War, she suddenly finds herself transported back in time and becomes an evacuee herself.
Will she be happy living with a different family, at a different time?
How will she get back to her own home?