The Adventures of Peter Wheat #63

Peter and Beetle are leisurely sailing on the lake when they encounter Queen Marsha of the Mermaid Kingdom and are invited to visit her underwater realm. During their underwater adventure, they face threats from Queen Marsha's enemies, including an octopus, but are aided by the Queen's guards and Blue Jay in their efforts to escape danger. With help from Beetle and Blue Jay, Peter manages to overcome the octopus threat, and the group successfully evades the immediate peril of the mermaid kingdom.