Deep in the jungle on the banks of the river lies Sir Wootleg's small outpost. Here he stores provisions for passing travellers who are searching for a legendary lost city somewhere in the jungle. The only way to search the jungle is to travel down the entire river by boat. Many adventurers have passed through here with their boats, but no one has ever found any trace of this civilisation.

Sir Wootleg has been here for years with Mr Mc Crane, hoping to outsmart the finders of the missing city and make off with all the lost riches himself. On the steamboat that arrives are cartographer Heny E'venaer and Professor Elisabeth Loststone. They are also searching for the hidden ruins and hope to quickly stock up on the last necessities before travelling on to the heart of the jungle.

In a mysterious cave beneath the crane lie the remains of an unknown pilot who met his unfortunate end while searching for the same lost civilisation. One thing is certain: in the jungle, adventure lurks around every corner.