When an end-of-term field trip goes horribly wrong and not all the students return, the teacher loses the plot. One student hatches a plan and together with the school bus driver, they attempt their own rescue mission. The lost children enter a new world through a subterranean portal and things take a twist when the group get split up. Umbadinga is full of mystery and intrigue. Their pursuit for self-preservation leads them into encounters with weird and wonderful creatures, but not all of them are friendly. Become part of the adventure in Umbadinga, be a fly on the wall during the battle and mind-boggling escapes. But the big problem is, can they get back home again? That's for you to find out!