What is the author's tone in Joni by Joni Eareckson Tada?

The overall tone of "Joni" is one that is positive and inspirational. The book begins with an account of Joni's diving accident. The reader is privy to every thought the injured young woman has. After she dives in the Chesapeake Bay and rams her head against a rock, she is unable to determine why she cannot move. She thinks she must be caught in a fisherman's net. The reader, of course, knows that she broke her neck and that she is paralyzed.