I stumbled with this game while reading an interview to one of the game developers demigods, wishing more of them were like it. That was enough for me, I didn't read any reviews nor saw any trailers or videos, anything at all. I think that's the right way to approach it, not having any background of the story or how it plays out. Since you're reading this I'm sure you're looking for more than a few words to make a decision (it's your hard earned money after all!)
So here it goes: You're April Ryan, an art student living in Newport, USA, at the end of the 22nd century. As you might expect, there's a lot of new technology here and there, but, gladly, this isn't a game about a dystopsian future or a post-apocalyptic world ruled by machines, but something closer to home. The world, as we know it, appears not to be whole, and some sort of "leakage" from another place seems to haunt your dreams lately. The premise is simple, and as the game lays out all its elements, you start to discover what's going on, and challenge your own perceptions of place and reality. It all plays beautifully, with characters you care about, a well written story, great dialogue, and, despite sounding too cliche, a great adventure all around. Yes, the game has its faults: some dialogues might be too long, it's not always clear what things you can interact with, and some puzzles seem a little out of place; but in the end, the gripping story and all the positives I already mentioned should make up for it.