I just finished 'Tunnels' tonight. Here's my full review.
'Tunnels' is officially a 'kids’ book'- probably roughly the same target age as Harry Potter. It is set in England in the present day. The story starts out following a teenager named Will and his very dysfunctional family. Will's father is a highly educated archeologist trapped at a dead-end job as the curator of a forgotten museum. His mother is addicted to television; she rarely leaves her chair except to get food. Fourteen-year-old Will is a bit of an outcast with strange, pale coloring, but he shares his father's passion for digging. His twelve-year-old sister runs the household; she buys and cooks the food, pays the bills and cleans up after everyone. I found it to be a bit of a slow start, but I can see that it was necessary to set up Will's circumstances.
Will's father comes into possession of a strange little glass globe that glows brightly in the dark, and becomes unhealthily curious about strange, pale 'men in hats' that he sees around town. Meanwhile Will and his best friend, Chester, are busy with an excavation project of their own. Things run as 'normally' as they ever do in this strange household, until Will's parents have a fight and his father descends into his basement, never to return.
Will finds a blocked-up tunnel in the basement and concludes his father must've gone through it. He and his buddy re-dig out the tunnel and eventually enter a vast Georgian underground city populated a religious cult of pale people and dark, sinister priest-like 'Styx' who rule them with a combination of religious zeal and fear of their diabolical punishments. The atmosphere is creepy, threatening and decidedly unwholesome. Will faces many uncomfortable revelations about himself and his family. He also meets some interesting folks along the way; some of them even good!
This is the first book of a trilogy. (I think it's a trilogy.) There are a lot of loose ends, unanswered questions and the ending isn't really an 'ending.'
After the beginning set-up the pacing is fast and furious; almost as if the authors already had a movie deal  in mind when they wrote it. I read most of it last night, just finishing up the last two chapters over dinner tonight. (The book is 'soon to be a major motion picture.' according to the cover.)
It isn't the sort of book I would become a 'fandom fan' of; I just didn't have that kind of 'connection' with any of the characters. It is certainly compelling enough to look up the next book when it comes out and watch the movie. Â
Is it 'Zorkish?' (IMO) Somewhat. The very beginning of their time underground, when Will and Chester start exploring, was VERY Zork-like. The Colony, the Eternal City, and the labyrinth certainly wouldn't be out of place in Zork. The strange machinery and oddly advanced sciences could certainly fit in, but there's no magic as far as I can tell.
It didn't feel traditionally Zorkish to me, but thinking along the lines of Zork Nemesis this could fit in quite well. The diabolical alchemists would feel right at home among the seemingly sociopathic Styx. I could also see them as the sort of fanatical cult that could have sprung up in the Underground after the fall of the Flatheads.
So, yes, the book is definitely worth reading for Zork lovers in search of something reminiscent of Zork.
**** Stars.
This reminds me that, when I read the first Harry Potter book several years ago, the very first thing I thought was how Zorkish it felt. If you combined the Harry Potter books' characters, magic and 'feel' with 'Tunnels' setting, you would have a near-perfect Zork substitute!