PSYCHIC researchers are heading to Brighouse.
The ghost-hunters want to investigate supernatural happenings at the site where Robin Hood is said to be buried.
The research team includes Brighouse woman Barbara Green, founder of the Yorkshire Robin Hood Society.
Also in the group are David Farrant, president and founder of the British Psychic and Occult Society; author of mysticism books Gareth Medway; John Pope De Locksley, who believes he is descended from Robin Hood; and Catherine Fearnley, secretary of the Yorkshire Robin Hood Society and the British Psychic and Occult Society.
The group plans to visit Robin Hood's supposed grave, which is said to be haunted by the ghost of a woman.
The grave is 650 yards from Kirklees Priory Gatehouse on the Kirklees Hall estate.
One theory is that this is the ghost of the prioress, believed to be Robin Hood's cousin.
Mrs Green, who has written several books on Robin Hood, believes the prioress killed the outlaw in 1347 by bleeding him to death while giving him medical treatment.
The researchers will hold a night-time vigil at the grave, measuring temperatures and air pressure and using night-vision cameras to capture supernatural activity.
Mr Farrant said they would look for logical explanations for people's spooky sightings before putting them down to supernatural activity.
He also says rumours that there is a vampire at the grave site are "ridiculous".
"It is a lot of nonsense," he said. "But there are genuine reports from people who have seen the ghost of a woman, which is invariably described as being of a fiendish disposition. Definitely not friendly."
The research team will also be visiting The Three Nuns pub at Mirfield and Stoney Royd Cemetery at Water Lane in Halifax.
The pub - built on the site of a hostelry dating from 1497 - is believed to be haunted by the ghosts of nuns thought to have fled there from Kirklees Priory when Henry VIII dissolved the monasteries in the 1530s.
Mr Farrant said: "The sites are all supposed to be on the same ley line and supernatural activity on each site could be connected.
"Ley lines are lines of energy which criss-cross the Earth's surface. Churches and temples were often built on them and psychic phenomena often occur along ley lines."