The Freeze strolled out to 3-0 leads in both the first and the deciding set, only to see their lead mowed down by a fast-finishing Perth outfit.
Canberra did manage to claim the second set, a tense, see-sawing battle between the two teams desperate to keep their grand final hopes alive.
Perth will head into the final round hoping for a win and for other results to go their way, while the Freeze will likely have to start considering draft targets after coughing up what looked like a certain win here.
Perth storms home to steal first set
Shortly afterwards Perry found Monty again and the Freeze were off to a flying start in offence.
Perth needed some spark to stem the bleeding and they found it in Kyal Oh, who turned the disc over in defence before racing downfield to score a much-needed goal.
When Matt Dowle extended Canberra’s lead to 4-1, there were danger signs for Perth. The Power threw caution to the win with some chancy passes and were rewarded with goals to Monte Maserei and Pete Eley to close the gap to just one goal.
Canberra equalise in thrilling second set
Canberra raced out of the blocks again to start the second set, Gav Moore crossing for an early lead.
It opened the door for a seesawing battle with Timocles Copland grabbing a brace of goals for Perth while the Freeze found a response on both occasions.
An uncontested foul handed Perth valuable field position, though, and Ash McInnes capitalised to give Perth the lead with just over three minutes left in the set.
The same match up of Monte Masarei and Gavin Moore who contested the disc at the other end clashed again, this time Canberra getting the call and Andrew Jackson crossed to hand Canberra the lead heading into timecap.
Both sides squandered opportunities in timecap before Copland eventually crossed for Perth, forcing universe point.
And Moore made sure the match would go to the final set with the winning goal, giving Canberra the second set 7-6.
Canberra throw away the lead and the set
It was deja vu in the third set, which started in identical fashion to the first.
Canberra roared out to a 3-0 lead courtesy of goals to Monty and a brace to Spielman.
And again Perth came back, with Masarei and Shepperd crossing to slash the deficit to just one goal.
Again the two teams traded blow before Masarei took an intercept and put Gan across to lock the scores up in the final five minutes of play.
English import Rachel Turton managed to cut her way through traffic for an exceptional goal for Canberra, but Murray-Yong produced a flat forehand pass to find Gan in the corner and the scores were even once more.
Perth held the disc in hand in timecap and made sure of the result, Copland crossing to seal the deal.