What an unexpected and lovely story! Beautifully written and engaging, this short novel has 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!