Burglars broke into a Lamport house and searched it while the residents slept upstairs.
The house in Isham Terrace was broken into some time between 11pm on Friday, October 31, and 7.30am the following morning.
The thieves took a handbag, a purse and a set of car keys.
They then used the keys to steal a grey Volkswagen Golf, registration number KS10 TZF.
Witnesses, or anyone with any information about this incident, should call Northamptonshire Police on 101 or Crimestoppers on 0800 555111.