Trapped in Gondwana: Charlie & Hamish - Trapped in Gondwana, #2

Imagine travelling back through time to the ancient supercontinent of Gondwana where extinct animals still exist and mystical spirits roam the forests. That is what happens to eleven-year-old Nellie Russell. She rescues New Zealanders, nine-year-old Charli and her half-brother Hamish, who are trapped in a cave. Together they must complete a dangerous mission, pass a mysterious Big Test and find their way to the centre of Gondwana before sunset or they will be trapped on the pre-historic continent forever.
Will they all make it back to the centre in time?