Reading progress update: I've read 401 out of 599 pages.

Illuminae - Jay Kristoff, Amie Kaufman

Ugh, 200 pages to go and I'm still not sure what Phobos is, if the Lincoln is coming, or if both our main characters will survive or not.  It's tense, it's almost over, and I have remember this is in fact a series.  So they both can't die, right??