This is a tale of fun, adventure, a little sadness, humour and the book itself has a secret of its own Rosie and Lottie live on a special base. There is a large guarded building and nobody is allowed in. There were all sorts of rumours about what was inside and eventually Rosie decided that she just had to find out what was in there. Aided by her best friend Gracie and Lottie, she put together her Plan to find out the big secret.