Police are appealing for witnesses after a 57-year-old woman was found with head injuries in Oundle.
The incident happened on West Street and occurred between 11pm on Tuesday November 27 and 3:30am on Wednesday November 28.
The woman remains in hospital. Officers are investigating the incident and exploring a number of possibilities including whether the injuries were accidental.
Witnesses to this incident, or anyone with information, should call Northamptonshire Police on 101. Or, information can be given anonymously to Crimestoppers on 0800 555 111.