Join the Loud family as they embark on a hilarious and exciting journey filled with fun, friendship, and unexpected twists. When the family goes on a vacation to Scotland, they stumble upon a hidden castle and discover their royal heritage. With the help of their new Scottish friends, the Louds must navigate the challenges of being royalty while staying true to themselves.

Lincoln and the Louds are ecstatic to welcome their new Gran-Gran, Myrtle, into the family with a tropical wedding celebration; but the festivities are cut short when an old nemesis from Myrtle's secret agent past appears on the island.

Sequel to The Loud House Movie.