Thieves got into a house in a village just outside Northampton by climbing through an open upstairs window.
They stole various property from the house in Brafield-on-the-Green including electrical items and jewellery, and it is believed they may have been disturbed when the alarm was activated.
The burglary happened on Tuesday August 19 between 2pm and 2.30pm.
Officers would particularly like to speak to the driver of an old-style blue Ford Fiesta which was seen using a nearby driveway to turn around in at around the time of the burglary.
Witnesses, or anyone with information, are asked to call Northamptonshire Police on 101. Alternatively, they can call Crimestoppers on 0800 555111.