I really liked the characters. Wren and Callum were a very interesting combination. You can't help but like Callum. His innocence and good nature was a start contrast to Wren's hard exterior. As far as that saying "opposites attract" you can't deny it with these two-- they are as close to polar opposites as you can get.
The action is pretty quick and will keep you turning the pages. However, the plot itself is a bit long winded. At 365 pages, I would say a good 50 of those could have been edited out to make this a shorter read. I made it to the final 30 pages before I decided I just couldn't devote any more time to the book.
I hate saying I did not finish a book, but as a person that can devour books in a day, if something takes me more than a week to read it becomes a flag. Reboot took me several weeks before I put it aside. By the time I reached the end of the novel I felt like I knew what would happen. The most critical aspects of the plot had occurred and I needed it to wrap up. Instead of getting closure though, it felt like a whole new plot was beginning. I just didn't feel like I wanted to invest in the time it would take to wade through those dense moments of Wren's inner conflict to get to the goods.
If I had been in a better mindset, or reading this in a car with no other books, I would have finished it. But when there are so many books waiting to be read, it's hard to stick with one that isn't holding your attention. Will I read the next book in the series? Most likely.