The second book in the "Remember the Future" series has lots of adventures in store. Katherine, Trevor and Chryseis embark on a ship and sail to remnants of the sunken continent of Atland. Suddenly everybody is after a mysterious speaking stone from the fabled land of Lyonesse and some of the strange sea creatures are not as amusing as they seem. The children embark on a ship to search for the missing stone - with the Edfunian giants hot on their heels.