A New Jersey couple is suing the people who sold them their dream home for neglecting to tell them about a stalker who calls himself “The Watcher,” who has been harassing them since they moved in.

Derek and Maria Broaddus paid $1.3 million last year for their six-bedroom Union County dream house only to learn of “the Watcher,” who had a fixation on the home​, the suit says.​

In ​their suit, the couple says the stalker threatened them with several letters and packages — mail the previous owners received before unloading the haunted house.

The house “has been the subject of my family for decades,” one letter said.

“I have been put in charge of watching and waiting for its second coming,” said another.

Two others allegedly refer to the couple’s young children. “I am pleased to know your names now, and the name of the young blood you have brought to me,” one reportedly says. Another asks, “Have they found out what’s in the walls yet?”

The threats were enough to send the Broaddus​es packing. The new owners claim the home’s previous owners, John and Andrea Woods, received at least one letter from “the Wat​​cher” in May 2014.

The house was sold June 2, 2014. Three days later, the Watcher introduced himself to the new owners.

Their lawyer, Lee Levitt, declined to comment.

The Woods could not be reached for comment.

The suit says the Broaddus family has been “consumed daily by stress.”

They are trying to sell the home, but buyers have been scared off by the Watcher.