[Anonymouse]

I've always favoured Heinlein, too. Certain of his novels are only available as audio books - The Cat Who Walks Through Walls, Stranger In A Strange Land, 'The Number Of The Beast' among others.
Plus the brilliant Have Spacesuit - Will Travel.
I discovered this at primary school as a library book...and I borrowed it for ten weeks straight. It'd make a great TV series. It's a bit of a commentary on US education in that the hero's father describes the high school course Kip's taking as "Twaddle! Beetle tracking! Occupational therapy for morons!"
To illustrate:
"Why, Dad, Center is a swell school. It's run along the latest, most scientific lines, approved by psychologists -"
"- and paying excellent salaries for a staff highly trained in modern pedagogy. Study problems emphasise practical human problems to orient the child in democratic social living, to fit him for the vital, meaningful tests of adult life in our complex modern culture. Excuse me, son; I've talked with Mr. Hanly [the principal]. Mr. Hanly is sincere - and to achieve these noble purposes we are spending more per student than is any other state save California and New York."
"Well...what's wrong with that?"
"What's a dangling participle?"
I didn't answer.
"Why did Van Buren fail of re-election? How do you extract the cube root of 87?"

English A (commonly known as Bonehead English), anyone?

In other words, they're not teaching the kids so much as keeping them busy. But with the help of some hard books, Kip takes and passes his College Boards.

And then his troubles really start...

I wish they'd publish it in Kindle. I hope they do.

Also I have David Weber's Honor Harrington books. Though she isn't tall enough, Claudia Christian could've played Honor. Certainly she was strong enough; I met her at Cult TV, and she had a hell of a grip!
Nowadays I think either Brie Larson or Gal Gadot could play her (with camera tricks to make 'em look taller). Nimitz the treecat would be a doddle with CGI. Honor really comes across as genuinely humble...but not without her flaws, as shown in The Honor Of The Queen, in which she meets a man in charge of a prison which took in 53 of Honor's people as POWs, over half of them women...and she finds only two women, both of whom have been multiply raped and savagely beaten.
She comes this close to blowing the man's head off, in direct violation of her duty and oath as a Queen's Officer, and to ending her career. Now you can't blame her for her fury at the savage treatment of the POWs; I was halfway hoping she would kill him, before one of her officers pleads with her (exerting all his strength to stop her, giving you some idea of her strength) that by law he has to have a trial.
Which he does, of course. He has his trial, fair and above board...and he is summarily, and rightfully, hanged.