The novel likely revolves around a mysterious or adventurous tale set against a maritime backdrop. The title, "A Secret of the Sea," suggests that the plot involves hidden treasures, nautical secrets, or intriguing events related to the sea.The first volume introduces the central mystery or conflict, involving characters who are entangled in a story of sea voyages, maritime adventures, or possibly a quest related to the sea. The novel might include elements such as shipwrecks, hidden islands, and naval conflicts, with Speight's signature suspense and dramatic storytelling.