Detectives investigating the disappearance of author Helen Bailey have found what is believed to be a body.
Officers from the Bedfordshire, Cambridgeshire and Hertfordshire Major Crime Unit made the discovery in the grounds of Ms Bailey's home in Royston.
The 51-year-old novelist, who penned the Electra Brown series for teenagers, was last seen walking her dog on 11 April.
A 55-year-old man from Royston, who was arrested on Monday, has been re-arrested and is being questioned at Stevenage police station on suspicion of murder.
Officers search for the missing author
Detective Chief Superintendent Paul Fullwood said: "Helen's family have been updated of this significant development and are continuing to receive support from specialist family liaison officers.
"As you can fully appreciate this will be an extremely difficult time for them and they have requested their privacy be respected at this time."
He added: "We are also mindful that Helen's disappearance, which has attracted significant media attention, has not only had an impact on her family and friends but also the local and wider community.
Police released an image of her dog along with an appeal for information
"However, as we have a man in police custody it is not appropriate for us to make any further comment."
Following Ms Bailey's disappearance extensive searches were carried out at her home in Broadstairs, Kent, where friends originally said they believed the author might have gone in order to have "some time to herself".
Specialist teams had been searching her property in Royston since Monday, Hertfordshire Police said.