One autumn day, the phones in Coldwater, Michigan, begin ringing. The people calling are all departed loved ones. They say they are calling from heaven. On that same day, Sully Harding is released from prison for a crime he may not have committed. During his incarceration, his wife passed away. He returns to Coldwater a brokenhearted man, hoping to quietly rebuild his life with his young son. Instead, he finds his hometown gripped by miracle fever. As the mysterious phone calls increase, outsiders flock from around the world in hopes of sharing the blessing. When his son begins to carry a toy phone awaiting a call from his mother, Sully has had enough. He sets out to prove that the Coldwater phenomenon is a hoax. But is it? Or could this be the world's greatest miracle?