Await Your Reply by Dan Chaon
OK, maybe it's just because I'm sleep-deprived today, but...WTF did I just read?! If this is all supposed to be happening concurrently and Ryan's dad is really Miles' twin, then who the heck is Lucy's teacher supposed to be? And why, oh why, couldn't it have ended with the mysterious sophisticated blonde with a suitcase full of cash hooking up in Quito with the man with one hand? That would've rounded everything off neatly IMO.