Such a unique experience. Essentially it's two books in one. 
 I originally wanted to read this book because it's JJ Abrams, and I loved Lost. And from some reviews and the description, it seemed like the book would be really similar to the show as far as the otherworldliness vibe and the vagueness that would let you be part of the story as a reader. 
 The otherworldliness was there absolutely. The actual book, Ship of Theseus, totally catered to my Lost craving. And I actually really enjoyed that story. If Ship of Theseus was its own book, I'd totally read it just for that. And I can see myself rereading this story just for the book alone. I thought it was really cool and well-developed. 
 But the vagueness and reader-into-story-ness that I was hoping for was somewhat lacking. We definitely get a clear conclusion, and even though I like that in other books, here I was hoping for opposite, so I'm a little disappointed that I was provided with so much information and basically lead in the right direction. I felt like an observer rather than an active participant. 
 I'll also say that I wasn't really in to the whole romantic relationship with Jen and Eric. For a book that seems like it'd be very much adult fiction, this relationship made it all come across as so YA. And I really don't like YA, and it's because of romantic relationships that develop much like this one. These characters are my age - Jen is a little younger, and Eric is right there. But their emotions and perspectives and actions come across like high schoolers, and I found that to be really annoying. I think if I liked Eric and Jen more, this could have been a 5 star book. But for me, it's really more of 3.5 stars because they annoyed me so often. 
 But overall, this is a neat book. It's something you'd want to reread at a later time. But it's also a long read. I spent nearly the entire month of May reading it. You'll definitely want to be able to set aside an hour and a half to get through a chapter, so it'll take some time. Enjoy the long road.