Claudio Braga and Sabah Kerjota struck late as Hearts produced a dramatic comeback to beat 10-man Dundee and extend their unbeaten run in all competitions to eight matches.
Dundee looked on course for victory for much of the contest after Bradley Fink gave the visitors the lead.
The on-loan Wycombe Wanderers striker raced onto Imari Samuels' pass before delicately lifting his finish over Hearts goalkeeper Beau Reus.
Hearts struggled to turn their possession and pressure into clear opportunities, but the game changed dramatically in the closing stages.
With just under 10 minutes remaining, Christian Borchgrevink's cross struck the outstretched hand of Owen Bevan.
Referee Chris Graham initially allowed play to continue before VAR Andrew Dallas recommended a review.
After consulting the pitchside monitor, Graham awarded Hearts a penalty and Braga calmly sent goalkeeper Owen Goodman the wrong way to level the scores, ending his five-game wait for a goal.
Dundee's task became even more difficult when substitute Zan Besir was shown a red card following another VAR intervention.
Besir was dismissed for a high scissor challenge on Josh McPake, leaving the visitors to finish the match with 10 men.
Hearts piled forward in search of a winner and their pressure finally paid off in the 96th minute.
Substitute Kerjota fired a superb low strike into the far corner for his first Hearts goal, sparking wild celebrations at Tynecastle.
The victory moves Wouter Vrancken's side into second place in the Scottish Premiership, three points behind Celtic and five ahead of sixth-placed Dundee.
Hearts have now recorded 10 consecutive league victories at Tynecastle across this season and last, continuing an impressive start under Vrancken.
After questions were raised following heavy European defeats against Sturm Graz and Benfica, the Edinburgh side have responded with a strong run of form.
They appeared to feel the effects of playing three matches in eight days during a sluggish first half but improved significantly after the interval.
Following their thrilling derby victory at Easter Road on Thursday, Hearts once again demonstrated their resilience with another memorable late comeback.
For Dundee, the defeat was particularly difficult to take after a disciplined defensive performance.
Bevan and Ryan Astley combined for 20 clearances as the visitors repeatedly frustrated Hearts, while Ethan Hamilton impressed in midfield.
However, Dundee eventually tired under sustained pressure, with Besir's dismissal proving particularly costly.
There were further concerns for Dundee as Joe Westley and Finlay Robertson were both stretchered off.
Westley suffered a cheekbone injury, while Robertson sustained a knee problem. Ryan Finnigan was also forced off with an ankle issue.
Dundee will now hope for positive injury news before their next match against Motherwell in 13 days.
Hearts head coach Wouter Vrancken: "First half was not good enough, we were looking at what was happening instead of taking it on. That's not who we want to be. There was not enough guts on the ball.
"One ball in behind, it's not possible to defend like this on one long ball. That's all we gave away, they didn't create another decent chance.
"Second half I was happy with the reaction. We were in the duels, had quality on the ball, pressed and dominated them. They were defending the result.
"We were patient, tried to get the ball round them. We had to be faster in these moments, but we showed conviction. We never gave up, we kept pushing and got what we deserved."
Dundee head coach Steven Pressley: "It was a really difficult to manage because of the injuries we sustained, and the sending off.
"We think Joe Westley could have a fractured cheekbone, which is a hammer blow. Fin Robertson looks like he's hurt the outside of his knee. We don't know the extent of it yet but we're a little fearful. Ryan Finnigan had to go off with an ankle injury, we're more hopeful of that.
"The one thing is, the players have a never-say-die attitude. They were incredible, they kept going and going through adversity. In the end, we nearly got an outstanding result."
