From Wikipedia, the free encyclopedia Elaine Cassidy (born 31 December 1979) is an award winning Irish actress and is best known for playing the lead character Abby Mills in the American CBS TV series Harper's Island, Felicia in Felicia's Journey opposite Bob Hoskins, Runt in Disco Pigs opposite Cillian Murphy, and Lydia in The Others. Description above from the Wikipedia article Elaine Cassidy, licensed under CC-BY-SA, full list of contributors on Wikipedia. ​