There are few books which I can honestly say have altered my outlook on life, whose covers I have closed a different person. "Johnny got his gun" is one of them, though I fear I lack the eloquence to persuade you to read it.
It tells the story of a World War One soldier, horrifically wounded in battle to the point where he is totally cut off from the outside world. With only his memories for company, he attempts to make sense of his situation, and make the most of his world, such as it is. After a long time (having no way to measure time at first, he can be no more precise than this), he eventually manages to communicate with the staff attending him in hospital, and then with his army commanders.
Trumbo's masterstroke is, to my mind, quite subtle: he hardly uses any punctuation at all, save for full stops. This relates very effectively the disordered stream of the soldier's thoughts, and at times, makes the prose all the more disturbing.
His protests to the outside world, first unheard and later ignored, are extremely powerful and moving, and make the book as a whole demand repeat readings.
Everyone should me made to read this book at sometime or another.
(In case you were wondering, the other life-altering books were "One flew over the cuckoo's nest", "Slaughterhouse five", "Farenheit 351" and "1984" - read them all.)