These creepy letters from a stranger have left a family desperate to demolish their home.

A US family has been left so terrified by disturbing letters sent to their home that they are suing for the right to knock it down.

Since purchasing the six-bedroom New Jersey property in 2014, Derek and Maria Broaddus have received a series of notes signed by a mysterious figure who calls him/herself ‘The Watcher’.

“Who I am?” a letter read. “I am the Watcher,” stating the home’s walls and windows “allow me to watch you and track you as you move through the house.”

“Do you need to fill the house with the young blood I requested?” one letter said, according to court documents viewed by The Washington Post. “Once I know their names I will call to them and draw them out to me.”

“Have they found out what is in the walls yet?” read another. “In time they will.”

the watcher house lawsuit
The home that's become known as 'The Watcher House'. Image: realtor.com

The couple, who say they are too afraid to live in the home and have been unable to sell it, earlier applied for permission to demolish it and subdivide their property to make way for two new residences.

However, the Westfield planning board last January rejected the application, prompting the Broaddus' to file their recent suit to have the decision overturned.

“My clients are good people," said their attorney James Foerst. "They’re caught in a situation they didn’t ask for."

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Local police are yet to identify the person responsible for the letters. However, the mystery writer claims to be just one in a succession of 'Watchers'.

“My grandfather watched the house in the 1920s and my father watched in the 1960s. It is now my time,” a letter read, according to The Washington Post.

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