The book was written by the sister of our friend Mary Daly. I loved it.
Here's the book:
And my brief review (votes are always good, hint hint.)
"What an unexpected and lovely story! Beautifully written and engaging, with many elements of real life making it so alive. A little boy who is under cancer treatment, a good and kind doctor, and twin sisters who carry crosses with courage. The mystery is well woven, the suspense done just right. Everything is unraveled in time, and we get to know a lot about a beautiful grotto in Iowa. I enjoyed very much the many Catholic references as well. I highly recommend this short novel, and a wonderful value it is!"