A man stood in front of a grey Mercedes AMG and enticed the driver out of her car in the Morrisons car park in Kettering Road between 11.30am and 11.45am on Saturday, November 23.
As she got out, the offender got into the driver’s seat and attempted to start the engine, according to police.
The woman managed to pull the man out of her car before shouting for help, causing him to run off.
Anyone with information or who may have witnessed this incident is asked to call Northamptonshire Police on 101 quoting reference number 19000627908.