Season Four picks up six months later, when Duke suddenly appears out of thin air in Boston, and is rescued by Jennifer Mason, a woman with a mysterious ability and connection to Haven. Duke and Jennifer make their way to Haven, only to discover that the town is under siege -- because the barn was destroyed, The Troubles never left. In fact, they're worse than ever. Now The Guard, a shadowy organization of troubled people, patrols the streets trying to keep the Troubles under control.
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