A few years back I was really impressed by the movie "Beneath Hill 60", and wondered why Australian films can't all be that good. But that's a discussion for another day. Anyway, when I saw the book I decided to pick it up, even knowing that it was not a "novelisation" but rather the big picture of tunnelling in WWI, at least up until the blowing of the mines at the Battle of Messines.
I'd advise you to see the movie and read the book, as they really do complement each other well. The book is military history, focusing on tunnelling in the area, and also on Capt Oliver Woodward and the 1st ATF - made up of antipodean miners, a combination not noted for inspiring confidence in British generals. Still, they did a job: defending the mines by countermining German approaches and also going over the top on raids armed with explosives to clear out troublesome German positions. This is a part of the War I knew nothing of, and I am glad to have remedied that lack.
Its also amusing to compare the book to the movie: a lot of the moments of high tension in the movie are clearly there for dramatic licence, or at least, are not corroborated by the histories. But this detracts from neither, as they have different purposes and different mediums. This is a story, and history, that should be more widely known.