Substitute John O'Flynn grabbed a stoppage-time winner as Exeter came from behind to beat Northampton.
Jacob Blyth placed a neat finish past Artur Krysiak to give the Cobblers an early lead.
The visitors drew level when Scot Bennett beat Matt Duke from Craig Woodman's delivery.
Clive Blatt and Blyth both failed to convert chances in front of goal and they were made to pay when O'Flynn headed home to snatch the points.
VIEW FROM THE DRESSING ROOM
Northampton Town manager Aidy Boothroyd told BBC Radio Northampton:
"We had five or six times more opportunities than Exeter but you've got to put them in.
"I'm focusing on the performance. There have been good performances individually and collectively and there's been some errors.
"I was pleased with Clive Platt and Jacob Blyth but I'm pleased with a lot of things.
"You can be absolutely brilliantly and get beat and you be rubbish and win. We're not getting what we deserve. In the end, you do."
Exeter City boss Paul Tisdale told BBC Radio Devon:
"It was a delight for us but very cruel for them - it's rare you'll see two teams going for it at 1-1 in the last five minutes.
"We kept picking the pace up - we had real intensity in our attacking play.
"They're the best side we've played this season so the league doesn't reflect what they are capable of. It was a game of doing the basics really well and I'm hoping we can see the signs of improvement in our team from last season."