Derivative and largely formulaic thriller, but nevertheless one that remains suspenseful and compelling throughout the entire running time thanks to the raw & gritty atmosphere and a handful of extremely brutal shock-moments. Reminiscent to the other recent British flick "Attack the Block" in terms of tone & social setting, "Tower Block" takes place in a pauperized and crime-infested big city suburb where people abandoned all hope for prosperity long time ago already and desperately avoid every type of contact with fellow human beings. The film entirely takes place in a large apartment complex that is scheduled for destruction and only the residents of the top floor still live there. One Saturday morning, they are rudely awakened by a relentless psycho killer with a sniper rifle. He – or she – fires at everything that moves and placed booby-traps across the building. There's a obvious link with an unsolved murder committed in the block a few months earlier and now the asocial tenants are forced to rely on each other for survival. The biggest trumps for a film such as "Tower Block" are surprise and unpredictability. All the residents are equally insignificant, meaning that literally anyone of them could be next. And they could be next at any random and possible moment, too. Writers/directors duo James Nunn and Ronnie Thompson aptly play with these trumps, as the characters definitely don't die in the order you'd expect. Sniper murders can perhaps get a bit monotonous after a while, but there's enough diversity in killing methods and circumstances. Obviously there's quite a large number of holes and irrationality in the plot and the climax (as in: revelation of the sniper's identity) is weak and disappointing. The acting performances vary between adequate and amateurish, with good roles for tough blond gal Sheridan Smith and "Alien³" veteran Ralph Brown. In case you want to seek out more "serial sniper-killer" movies after this, I warmly recommended the almighty "Dirty Harry" but also the more obscure "Two-Minute Warning", "Targets" and "The Deadly Tower"