Thieves broke into a house in Corby, threatened the householders and stole cash and jewellery.
The break-in happened on Saturday, March 21, between 2.50am and 3.10am, in James Watt Avenue.
Three men broke into the house, threatened one of the occupants with a knife and demanded money.
They also stole jewellery, including rings and necklaces, before escaping.
It is believed they entered and left the property through a ground-floor window.
The men are described as slim, about 5ft 9in and dressed in black.
They spoke with an unidentified accent.
One of the men was carrying a black-handled knife and another carried a black torch.
Witnesses, or anyone with information, is asked to call Northamptonshire Police on 101.
Alternatively, they can call the independent charity Crimestoppers anonymously on 0800 555 111.