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Abby Mills – The Good Girl (played by Elaine Cassidy). Abby Mills is a natural beauty in her mid-twenties who hails from Harper's Island. She is the groom's best friend and his wedding brings her back to the island for the first time since her mother was murdered seven years ago. Abby's father, the local Sheriff, gunned down the psychopath at the end of his killing spree, but the event shattered Abby's relationship with her dad and left her haunted by her mother's death and the memory of the man who killed her.

Henry Dunn – The Groom (played by Christopher Gorham). Henry Dunn is a pauper marrying a princess. While growing up, Henry worked summers on Harper's Island, tending to the boat of real estate mogul Thomas Wellington. Now he returns to the island as the fiance to the mogul's beautiful daughter, Trish Wellington. Henry may have won the heart of Trish, but he still faces stern resistance from his soon-to-be father-in-law who disapproves of Henry and would love nothing more than to see this wedding never happen.

Trish Wellington – The Bride (played by Katie Cassidy). Trish Wellington is the radiant bride-to-be who loves Henry Dunn with all of her heart and can't wait to marry him. Money is no object for a Wellington, so Trish's perfect wedding comes in the form of a grand week-long stay on Harper's Island, full of activities, food and fun for her family and closest friends. Trish doesn’t care about Henry's lack of pedigree, but she is Daddy's Little Girl and finds herself torn between the two men in her life.

Chloe Carter – The Flirt (played by Cameron Richardson). Chloe Carter is one of Trish's bridesmaids. She's sexy, playful, impulsive and always looking for ways to live life to the fullest. She has a surprising curiosity about serial killers, especially John Wakefield. But beneath the blonde bombshell exterior is an intelligent woman searching for romance and love.

Jimmy Mance – The Old Flame (played by C.J. Thomason). Jimmy Mance is a local fisherman who couldn't be happier about the Wellington- Dunn wedding coming to Harper's Island because it brings Abby, his high school sweetheart, back to the island. Jimmy immediately renews his pursuit of Abby, even though he harbours some resentment toward her; in seven years she never wrote or called. The years have been difficult for Jimmy and he did some things that Abby will find very surprising.

Sheriff Charlie Mills – The Sheriff (played by Jim Beaver). Sheriff Mills is the law on Harper's Island, and Abby's father. He ended John Wakefield's deadly rampage seven years ago, but not before Wakefield took the life of his wife, Sarah. In his grief Mills sent Abby away and. now that she's back for the wedding, he hopes to reconcile with her. But times have changed and Sheriff Mills has some dark secrets he has no intention of sharing with his daughter.