Cage of Stars by Jacquelyn Mitchard

A young Mormon girl finds herself torn between retribution and forgiveness in The Deep End of the Ocean author Mitchard's latest. Twelve-year-old Veronica "Ronnie" Swan witnesses the murder of her two sisters in her family's yard in tiny Cedar City, Utah. Murderer Scott Early is immediately apprehended, but is diagnosed with schizophrenia and ends up spending just three years in a state mental hospital.