Although brother and sister, ten-year-old James and nine-year-old Olivia couldn't be more different. James is the action man, with interests in everything sporty and adventurous. Olivia, on the other hand, spends most of her time in her own fantasy world that she takes with her wherever she goes.

The beginning of their summer holiday is here, a time when they don't have to get up early to go to school. This is their favourite part of the year because they usually spend the first week or two with their Nanny Josie and Grandpa Jack on their wonderful farm in the country.

Nanny and Grandpa seemed to be ordinary farming folk ... until strange things began to happen in and around the farm and the nearby forest.

Something ... different ... always happens in the forest. Olivia is sure that Grandpa Jack can explain, or maybe...