This was a fun book. Not in any way believable but still a lot of fun. I am an engineer and can understand some of what these guys were designing and I have worked some really weird hours to get projects done. That part is partly believable. The part that isn't is having one guy who is a super engineer and can design everything associated with a complex piece of ewquipment and make it work right the first time. Doesn't happen. It would be nice if it did. The rest is pure Frankowski. You either like it or you don't.