Cinema's most effective chillers have traditionally struck a nerve with audiences because they tap into our primal fears: fear of the dark, fear of the ocean, fear of having our still-beating hearts ripped out of our bodies… that sort of thing. But in recent years, a new genre of movie has emerged, one which delves into the black pit of middle-class values and emerges with the kind of story that would give Daily Mail readers night terrors.

We like to call them Hoodie Horrors and there's something strangely and perversely attractive about them.

Despite their quite disturbing (and mostly unrealistic) depiction of a world over-run by unruly children, vicious teens and murderous adolescents - admittedly reflecting but hardly representative of today’s youth - they brilliantly play up to adult fears by presenting the worst possible incarnation of the next generation. Films like Eden Lake, Heartless, Adulthood and Kidulthood don't just try to show it like it is, they show it how you're terrified it might actually be.

Often purporting to reflect modern society's ills by putting a mirror up to the street violence and gang culture that are turning our streets "into a bleeding war zone" (albeit in the guise of mass entertainment), they are effectively a new way of unsettling a small corner of humanity which has become too ghettoised in a comfortable world of Ikea furniture and organic food to feel properly connected with the real world.

Now, striding into this sub-genre of thriller comes Harry Brown. The story of a retired ex-Marine and recent widower who goes postal following the vicious murder of his best mate by a gang of mindless thugs. It's a gritty, raw, violent and pretty unbelievable account of life on London's council estates.

Ignoring the very real problem of black-on-black gun crime and instead depicting a heightened reality in which kids ride around on mopeds and shoot young mums for fun, it's a world in which the villains wear too much cheap gold, say "Blood" a lot and act as if they've stepped off the set of Edward Woodward's The Equalizer.

Simply put, it's ridiculous. But it's also brilliant, despite itself and because of the sterling work of one man.

If anybody can carry off the whole Death-Wish-with-a-bus-pass shtick, it's the national treasure that we call Sir Michael Caine. Channelling Jack Carter and Harry Palmer into an older, more thoughtful, but no less kick-ass OAP, he makes the whole thing work by treating the material with a reverence it may not fully deserve and making us truly care about an old codger's attempts to put the world to rights.

Not a film to be taken too seriously - the sledgehammer-light symbolism and broadly-drawn characters put paid to any notions of reality here - it's nevertheless a decent revenge flick and a fine tribute to the work The Man Who Would Be King (of a grimy council estate).

Harry Brown is due for release later this year.

Glen Ferris