I read this a few years back, it was given to me by an ex boyfriend who highly recommended it - IT'S BRILLIANT. As well as being a good story the text adds so much to the suspense, I've only come across one other thing like it, which was a pair of Russian films (Horror / Thrillers - for anyone who likes vampire type things like 'Underworld' you might like these films) which were subtitled but every now & again they would fade or drip down the screen or zoom off to one side, interesting films to watch just for the subtitles! Great book - don't be put off by the fact that it's a brick, I've never seen one standard book size only ones as big as a hardback.
Sorry forgot to say the films are called 'Nightwatch' & 'Daywatch'.