Tunnel in the Sky by Robert A. Heinlein. A fantastical work of science fiction! This has got to be one of the best science fiction works I've read. It was little more than a hundred pages at yet it felt so much like an epic! So much happened! I became so connected to the characters in that short time! Very captivating! To check out my full review, go here >> https://www.youtube.com/watch?v=I5rZC6fNg0I
Tunnel in the Sky was one of the first Heinlein books I ever read; my dad had an old copy kicking around, and I ended up mooching and reading it some time in my middle teens. This was one of the first books that started my love of golden age sci-fi.