"This is a world of fools! A world of slaves!"

Strange singing coming from the River Thames? Check. Odd glowing lights coming from the water? Check. Weird creatures living underneath Cleopatra's Needle on the Embankment? Check.

Another dangerous and terrifying adventure awaits Joe Druitt and his friends Eddows and Flo as they uncover the terrible truth about the ancient stone monolith on the banks of the world's most famous river, and the connection between it and the tragedy of the paddle steamer the Princess Alice over a hundred years ago. And if that wasn't enough for them, the teens are pursued by a sinister stranger and his faceless wax men...