The characters are wonderful, especially Mary, Colin, Ben Weatherstaff and the "Yorkshire angel" Dickon. The changes that happen to both Mary and Colin throughout the book are a delight to observe.
I feel protected and happy once I've finished this book, things turn out happily, for the best and the image I have in my head of the Secret Garden surpasses anything I have ever seen in real life - and that is fine, for this is literature.
Read it.