Twelve-year old Katherine has discovered that her eighteen-year old brother Sean has fallen in love with Meagen McCartney and plans to marry her. She sees this as a serious problem since Sean is needed at home to help run the family farm in Blessington, a little village a few miles from Dublin. But she soon hears of an even more serious problem: Sean has foolishly borrowed money from old Mrs. O'Hara, the crooked village money-lender, and has fallen behind on his payments. Worried that the old lady will have Sean jailed for failure to repay the debt, she seeks advice first from the local constable and eventually ends up in "Leprechaun's Glen" where she encounters Shamus, a peculiar little man who promises to solve her problems. But with leprechauns there's always a catch, and things get worse before they get better before Shamus finally solves everyone's problems in the unlikeliest of ways.

An intermediate reader for ages 9-12.