"The Prayer Box" is a novel by Lisa Wingate that tells the story of a woman named Tandi Jo Reynolds who discovers a box filled with prayers and letters while cleaning out her late grandmother's home. The box serves as a connection to her family's past and reveals the struggles and hopes of those who wrote the prayers. As Tandi reads the letters, she learns about the lives of the people in her community and the power of faith and forgiveness. The story explores themes of healing, redemption, and the importance of understanding one's roots.