Billed as Scotland's game of the day it was certainly Firhill for thrills for the away supporters when once again they demolished a contender for the title.
The first chance of the game fell to Falkirk when Darryl Duffy's shot hit the sidenetting to show that the writing was on the wall and it was only a matter of time before the breakthrough came.
In the 13th minute a throughball from John O'Neil found ex-Partick Thistle player Andy Thomson - he squared the ball to Duffy who sidefooted in from close range for the opener.
The home side had a couple of chances from Ken Milne with a header and Juan Ramon Escalas with an 18-yard volley which was expertly saved by the Falkirk keeper.
The second goal for the visitors came in the 24th minute when Russell Latapy picked up a slack clearance from the Thistle defence and slotted a ball through to Duffy, who chipped the keeper.
After the break the visitors went three ahead, a Lapaty corner was touched on by Kevin James and the ball fell to an unmarked Mark Campbell who shot in from close range.
The home side got one back in the 65th minute - a cleverly worked one-two between Escalas and substitute Emanuel Panther who shot home for the only goal for the home side.
Falkirk made it game, set and match four minutes from the end when substitute Pedro Moutinho cleverly worked his way on to the ball and passed to an unmarked Neil Scally, who converted from six yards out.