All the Crooked Saints, by Maggie Stiefvater

Straying from her usual brand of quirky romantic fantasy, Stiefvater ventures into the weird and wonderful territory of magical realism. The Soria family has long been the guardian of miracles in the small Colorado Desert town of Bicho Raro. One of the family serves as Saint to help pilgrims acknowledge their inner darkness and bring on the first miracle. The pilgrims must then bring on the second miracle by healing themselves. The Sorias cannot help with this part, for fear of bringing out their own darkness. In recent times the delay between first and second miracles has stretched longer and longer, with damaged pilgrims hanging around Bicho Raro like a bad smell. Touched by sadness, the Sorias themselves are disunited and disaffected and the three youngest family members – Saint Daniel, emotionless Beatriz and devilish Joaquin – want change. It takes a young man with a hole in his heart and no darkness in him at all to bring the Soria family together and help out the hapless pilgrims.