Atlantisville Repercussions: Book #2 of Caverns series in Bloomington, MN

Sam and Kyndrah love being the King & Queen of Atlantisville. But a rogue named Duke and his evil associate Tess accuse them of being in league with the devil and cause a reign of terror in their fairy tale kingdom.
A magical sphere and broach from their cavern treasure trove help them and their friends fight for their lives.
And finally a couple of unusual things happen that change Atlantisville forever. One series of events breathes new life into the castle and the kingdom. And the other life changing event in another world helps insure that the current peace and tranquility will have a better chance of continuing.