I’d give it five stars, except it left me hanging after moving to Penrose. I thought they would elaborate more on what happened at Penrose which is how they started selling more kits and other people they brought along and what replaced Mabel etc. also there were a lot of writing errors and unfinished sentences that cut off. Shame on the editor not the author. I’d recommend this if you’re really into rocketry and want to know about the early days.