Prince Lucas visits the underwater mermaid kingdom in this twenty-second magical adventure of The Kingdom of Wrenly series! After many years, the mysterious mermaids have finally opened their gates to the Kingdom of Wrenly. No one is more excited than Prince Lucas and Clara, who are visiting the underwater castle for a royal ball! But when they arrive under the sea, the children discover that not every mermaid is happy about the new visitors from the mainland . . . The Kingdom of Wrenly chapter books are perfect for emerging readers.