Thieves escaped with jewellery after breaking into a house in Waterloo Way, Irthlingborough.
The burglary took place sometime between 7.30am and 6.25pm on Friday, October 10, and a small amount of jewellery was taken.
A police spokesman said: “It is believed offenders forced their way into the property using a jemmy on the front door.
“We would like to speak to anyone who may have witnessed this incident or who may have any information regarding it.”
Anyone with information is asked to call police on 101 or Crimestoppers anonymously on 0800 555111.