In the fifth journal found by us, the lucky and smug publisher, we learn that Charlie Small has become embroiled in an underworld from his nightmares ...At the end of his fourth journal, Charlie bumped into the infamous Jakeman - but when the mad professor was dragged down into the Underworld, a place under the earth containing extraordinary and dangerous subterranean creatures, Charlie had to follow - otherwise, how would he discover how to get back to his mum and dad? Charlie's fifth adventure takes him into an unreal darkened world, where anything is possible. But, will Charlie Small ever find a way out, or will he be trapped underground forever ...?