A retired businessman believes a fellow gym member could have vital clues as to who stole his £35,000 car - after the key was taken from a locker in a members-only part of the building.
East Hunsbury man Harry Singh, 71, went to do his usual exercise routine at the Virgin Active gym in Collingtree Park Health Club on the morning of Sunday, August 12.
He went into the changing room of the health club at around 7.20am while there were very few people around and placed his belongings in a locker.
As Mr Singh has been working out at the club for more than 15 years, knows many fellow gym-goers and knows the changing rooms are protected by a keypad, he did not secure his locker and never has.
But when he returned to the changing rooms at around 8.45am the car keys to his £30,000 black Mercedes S-Class had been taken.
"When I came back from having a shower, I looked under my coat and here was no key there." Said Mr Singh.
"The guy next to me said he didn't see anything.
"Then when I went outside the car wasn't there."
Both Virgin Active and Northamptonshire Police say they are working together to catch the culprit.
But more than a week since the theft, the car has not been recovered.
As the gym is secured by a keypad that only allows members to enter - Harry believes a fellow member will have vital clues as to who stole it.
"I've been a member since 2001 and it's only members that go inside.
"I'm fed up about it. At the end of the day, I've been going there for 17 years and my whole family goes there.
"Now I don't have a car."
If you have any information about the car theft, call Northamptonshire Police on 101.