The plot centers on an exiled dragon princess named Shimmer, who undertakes a quest to restore her homeland, the Inland Sea, which is now known as the Lost Sea after its waters were sealed up in the form of a blue pebble by a powerful witch named Civet. She gains an unlikely ally in the form of a young, orphaned human teenager named Thorn. Yep wrote Dragon of the Lost Sea at the same time he wrote The Mark Twain Murders as he frequently writes several books simultaneously, but in different genres as he often gets writer's block.
