Fast-paced and engaging enough that I finished this book in one day; unfortunately, the story was fairly formulaic and used too many of the "friends turned business partners" tropes you often see, which made it quite predictable. An over-explainy "this is how I did it" ending didn't help its case much. It also didn't really add anything new to the discourse on the ethics of actually being able to see into the future.

The epistolary format worked well enough and the various pop culture and tech references were thankfully not awkward the way you sometimes see in this sort of novel. Overall, it may be a page-turner but won't leave much of a lasting impression. 2.5 stars.