Jim Beaver and Katie Cassidy's (Ruby) Harper's Island will premiere on CBS Thursday, April 9, 2009 at 10:00-11:00 PM ET/PT and will conclude Thursday, July 2, 2009 at 10:00-11:00 PM ET/PT.
"HARPER'S ISLAND is about a group of family and friends who travel to a secluded island for a destination wedding. They've come to laugh… to love… and, though they don't know it… to die. As the wedding festivities begin, friendships are tested and secrets exposed as a murderer claims victims, one by one, transforming the wedding week of fun and celebration into a terrifying struggle for survival. In every episode, someone is killed and every person is a suspect, from the wedding party to the island locals. By the end of the 13 episodes, all questions will be answered, the killer will be revealed and only a few will survive." Source.
Source: ComingSoon.net.