Shamrock Shenanigans is a novella written by Diana G. Gallagher. It was first published in 1999 and is the nineteenth book in the Sabrina the Teenage Witch book series.
Description[]
When Sabrina finds a leprechaun in her kitchen, a joking remark leaves her in big trouble. Now she must steal the King of the Leprechauns' gold, which is stashed at the end of the rainbow.