From the press release:
Edge (aka Adam Copeland) will reprise his role of Dwight Hendrickson, a shrewd, longtime Haven resident and “troubled” handyman who can truly handle anything, and often does, as the town’s “cleaner.” A close ally of Nathan’s (Lucas Bryant), Dwight helps to cover up all of the town’s supernatural goings on and to keep Haven’s secrets hidden.
Season Three of "Haven" picks up immediately following the events of the gripping Season Two finale with Audrey (Emily Rose) having been brutally kidnapped, Nathan warned against pursuing a romantic relationship with Audrey, and Duke (Eric Balfour) seemingly engaged in a fight to the death with Nathan after he discovers his family lineage is to kill Haven citizens with troubles.
This season’s previously announced guest stars include Iain Glen ("Game of Thrones", "Downton Abbey"), Bree Williamson ("Gossip Girl", "One Life to Live"), Dorian Missick ("Southland", "The Cape"), Kate Kelton (Harold and Kumar, American Psycho 2), Nolan North (Uncharted video game series, "Pretty Little Liars"), and Claudia Black (Uncharted video game series, "Farscape").
"Haven", based on the novella The Colorado Kid from renowned author Stephen King, follows former FBI agent Audrey Parker, who becomes a cop in the small town of Haven, Maine, and soon discovers the town’s many secrets, which also hold the key to unlocking the mysteries of her lost past.