I first read that when I was about 6 or 7, or rather a shortened version that somehow had got mixed up with the Ladybird books on the shelves, and I was looking for something to read.
I can't remember what point I realised it was real, not a story, but I do remember dm's horrified look as I asked questions you don't really want to answer from your rather sensitive small dd.
She hid the book after that, and I've never read it again, but there's two parts that really stayed with me.
One was when she was released, and makes her way to a house and asks for help. The people there give her just a biscuit to eat at first, because they say that her stomach won't be able to cope with rich food, and Corrie realises that they are people who are caring for her.
The second one was she was preaching after the war about forgiveness. And at the end a man came up and thanked her for her talk and held out his hand to shake hers. She looked into his eyes and realised it was one of the SS men from the camp. And she shook his hand.
Both those made me cry at the time, and still make me cry now.
I don't know if I want to read it again, because it had such a big impact on me at the time.
For me it depends on the time. I've found some of Colin Urquhart books really helpful when I've been going through difficult times. There was one called "Anything I ask", which helped me a lot. I really wanted to meet him, but never managed it.
Sometimes the books where people see miraculous events time and time again. I enjoy them when I'm in a good place. If I'm in a bad place I want to (as Adrian Plass once put it) "kick them very hard between miracles" 😂 because it feels like everyone else in the world has someone come up at just the right time and have a word from a random person that is just right, except me...