In the fifth adventure in the Stagnant Swamp series, Simon and Claire voyage to the bottom of Stagnant Swamp in a stolen submarine in search of the Lost City of Stagnantopolis. Abducted by thieves, they will be forced to endure kidnapping, attempted murder and, worst of all, seeing Mrs Blanchings' floral bloomers. The famed Treasure of Stagnantopolis may be their reward, but only if they can outwit the thieves, their teachers, a crocodile named Snappy, six earwigs and an ancient curse, and make it out alive. Includes illustrations by Sharon Rowe.