An island people need the help of Sam Silver and the pirate crew of the Sea Wolf to stop a sneaky attack in the seventh book of the series.

Jan and Sara were already friends when one day they decided they wanted to write children's stories and it would be more fun to write them together. That was 15 years ago. Since then they've written over 130 stories - including some about ghosts, football, ghosts playing football and naughty gargoylz. Jan lives in Essex with her family and Sara lives in London with hers. They both have black cats who completely rule their lives. For more information, visit Jan and Sara's website www.burchettandvogler.co.uk and follow them on Twitter at https://twitter.com/BurchettVogler. Keep up-to-date with the Sam Silver: Undercover Pirate blog at http://samsilverundercoverpirate.blogspot.co.uk.