When aliens land their spaceship by the reservoir in Spooksville, Adam and his friends are almost forced to come with them for a little ride in space, a ride that might last forever.

Adam and his friends visit Ms. Ann Templeton's castle in Spooksville to find out if she is a witch, and while they think they are putting her to the test, she is really testing them.

Are there fairies and gnomes? Leprechauns and elves? Most people, including Adam, would have said no. But one day a whole herd of magical creatures invades Spooksville. At first they play childish pranks, and Adam and his friends are happy to welcome them. But quickly the pranks turn cruel, and Adam, Sally, Watch, and Cindy are soon fighting for their lives. Where did these little people come from? How can Adam and his pals make them go away?

When Adam and his friends find a cube-shaped crystal while hiking, they find it makes their wishes come true. Unfortunately, the stone wants to be paid for what it gives.