A nutter dressed as Santa Claus is roaming around some sleepy town in America wasting people who have been naughty (starting with an adulterer and her lover), and it's up to deputy whats-her-name and grumpy police chief Malcolm McDowell to sort him out.
I was getting fed up with slasher movies since they, at their worst, are just the same things you've seen over and over again (see Bunnyman massacre, Mask Maker etc). Silent Night IS the same sort of thing you've seen before, but it's really well made, contains actual tension, and is a beautiful film to look at.
Of course, there are plenty of undesirable folk for our killer Claus to perforate, from the bratty kid to the pervy priest to the pornographers, and you've got plenty of gore to go with it too (including a head split in two with an axe and someone getting fed into a woodchipper feet first). I'm no worshipper of Malcolm McDowell but here he's pretty funny as the ignorant police chief who won't listen to his deputy. "Don't put avacado on the burger" indeed.
Just shows that a good slasher film can be made if people can be arsed.