Ginn Hale's Rifter series is a masterpiece combining gateway travel to a different universe, magical realism, timetravel and m/m romance. This is the first of 10 parts of the series, each about 130 pages long. I read it first when it was made available in monthly PDF installments by the publisher in 2011. Nothing gripped me more last year - not even watching Fringe :-). The only thing the Kindle version lacks are the maps (but I didn't use them too much the first time, so I guess you can do without them).
Storyline - very mild spoilers -: It's hard not to, and I try not to give too much away. The story is alternately told from the viewpoints of two characters, John, at the beginning a student of ecology in a middle size U.S. university town, and Kyle, his weird roommate with two black swords and tattoos over his eyelids who claims to be a milkman but really comes from a different universe. A universe full of witches, oracles, priests that can rend the time-space fabric, social unrest boiling and a revolution under way. (Technology has mixed a bit due to the gate, so you might meet a character with a sword riding a bicycle.) I won't spoil things too much by telling you the two protagonists will fall in love eventually. The strain here, and indeed the unique aspect of the whole story, is on the word "eventually". For when travelling the gate between the two worlds the gate relocates the traveller also in time. (Be glad that the gate is travelled only a few times in the story, for it makes things already weird enough). As I said, the story is told from the, in themselves continuous, views of the protagonists. Expect that in one storyline the characters may already have shared friendly or intimate moments, while in the next they haven't even properly met yet. You might see one dear character killed in one scene, but not know who it was because you only get to know her much later in the series. An antagonist may, after heavy fighting, be finally defeated in one storyline, but in the next you meet the same antagonist still powerful and spinning clever intrigues. This sounds quite confusing, but it is all very logical, and you spend your time alternating between aha-moments, learning what happened piece by piece, and looking for clues how the cliff-hangers from the other storyline might be resolved. It is an immensely clever story, and I can't even begin to imagine the discipline that must have gone into writing it.
Ginn Hale is the author of Wicked Gentlemen, a very weird book about a demon and a police agent falling in love in a world where hell has surrendered to Christianity, and of the two-part Lord of the White Hell series that featured a fantasy world with a Harry-Potter-like university setting. The Rifter series has no overlap with either of Hale's previous books. It may not be as Gothic as the first, but is much darker, complicated and richer than the second. (Though I found all her novels and stories very well written and enjoyable.)