Word to the wise... don't read the first book and then this one, skipping #2. You *WILL* be utterly lost, about two thirds of the way thru this, when they reach 'civilization'. Having said, the writing is solid (no errors, author is capable of characterization, etc.), the story has carry-thru action... but it wasn't my favorite in the series.
First, I had problems with the fact that the heroine was a kick-ass wimp. You can't have a military sergeant who fortified herself as a result of abuses - who is supposedly strong - be soft n' squishy most of a book. A girl who was beaten by her family and aloof in the military would NOT be touchy-feely with a minotaur. She wouldn't. She wouldn't rub his back, she wouldn't wash his fur. That's not how it works. Either you have a wall around you, or you don't.
Second, the settings are too 'earthly'. There's a mall complete with mannequins and atriums, a health clinic complete with motivational posters and magazines, a subway with underground shop-fronts? Did we fall into an alien dimension or not?
Third, the handling of the minotaur was done weirdly/poorly. He starts out as a 'cast out' in a shack on the edge of nothingness, but we're teleported from there almost immediately to the fortified camp he made underground years ago. Why didn't he go THERE after he was 'cast out', if a) it was fortified, b) it was familiar, and c) he could do the same stuff there as he did at the edge of nothingness. It made no sense.
Worse was the ending. He's 'eternal' (does not age/die, heals like Deadpool, but not immortal because he can... age/die, not like Deadpool?). So because he's the only one with a *slim chance* of surviving, he's asked to sacrifice his life-force to jumpstart a forest's growth by jumping in a sacred pool (!?). But if he does, he'll probably die - so the human girl who is NOT immortal jumps in an sacrifices herself with him, and... she survives, because 'true love'. ?!?!?!!??!!? Well... YEAH... that makes total sense. (((((not.)))))
Have I mentioned I had trouble with this?