A British family with two young daughters has to go on the run and is transported to a new life in Australia as part of the Witness Protection Program.

Although their friendly liaison officer is transferred to another case, Emma and Nicola make a new friend at their new school.

The villains have followed the Cassidy girls to Australia.

Although the Australian police have relocated the girls to a safe house in Sydney, Emma may have revealed their new location by mailing a birthday card to Sam.

With their father having gone back to England to give evidence, the girls must come up with a plan of their own to get away from kidnappers Nina and Roy.