The Famous Five: Five on a Treasure Island by Enid Blyton

The children go to their Auntie's house for the summer and they go to their cousin's island. At the island there is a sunken ship that belonged to their cousin's great, great, great granddad. but one day two men come and try and steal some gold that the ship was carrying before it sunk.

By Russel Terry

The Famous Five are also a cartoon show you can find out more here or find out more about them and Enid Blyton here