Judy Katschke ; Mary-Kate Olsen ; Ashley Olsen Related books Dare to Scare Harpercollins Childrens Books • 2003 Two of a Kind #05: To Snoop or Not to Snoop? (Two of a Kind) Harpercollins Childrens Books • 1999 Two of a Kind #09: Calling All Boys (Two of a Kind) Harpercollins Childrens Books • 2000 Two of a Kind #25: Closer Than Ever (Two of a Kind) Harpercollins Childrens Books • 2002 Two's a Crowd Harpercollins Childrens Books • 1999