ellsing is already a masterwork, (albeit one in progress,) and volume four, as with all of the other volumes of the manga that have come before, seems to be no different. Hirano has outdone himself yet again, and proven, also yet again, that his style, like a fine wine, only gets better with age.
As with any manga series, I recommend you start with the first volume, (in order to maintain the story's general coherency and provide a more enjoyable experience overall,) but if you've already read through volume three, then this book is a definite must have! The artwork is excellent to say the least; Hirano's style has certainly come a long way since the previous three mangas! His work in Volume four is far more refined, and the storyline progresses in an adrenaline choked suspense ride jam-packed with the kind of gore and gothic crusaderism we've come to expect from Hirano. Again, a definite must have for any fan of Hellsing!