When Roy G. Biv, a leprechaun, appears and asks Colleen's help in saving the St.Patrick's Day parade, she offers items of different colors to rebuild his lost rainbow, but is reluctant to part with a special gift from her grandfather.
When a leprechaun grants Ryan O'Connor's wish one St. Patrick's Day, Ryan must find a way to grant the leprechaun's wish in return or his piano teacher, her house, and another student will be gone forever.