First, the reasoning behind the title-you, the player, have to exterminate all the vampires you find (they're a special kind known as nightwalkers) and it rains an awful lot. The premise is not entirely new too. In the 'Splinter Cell' series you're trying to sneak around in the dark too, but instead of international terrorists and spies, you have to attack these blood sucking creatures.

A question that the developers need to answer- why is this game so frickin' hard to play? The vampires come at you from all directions, before you've even had a chance to properly learn the controls and kill you in a single bite. Your weapons are useless, your enemies have unnerving psychic abilities that allow them to see you even if you're hidden, and the number of cut scenes that crop up every now and then has to be in the hundreds.