77. Mrs Frisby and the Rats of NIMH by Robert C. O'Brien (1970)
We said: Time is running out for Mrs Frisby, a widowed mouse whose home is about to be destroyed. Unfortunately, one of her children is sick and unlikely to survive the move – luckily, a mysterious band of rats comes to the rescue just in the nick of time.
You said: It just has everything needed to capture a child's imagination, a wonderful, fully realised world, secrets, danger, intrigue, loss, love, and believable, wonderful characters. I still go back to it.