The Treasury of Mercy is a tender, faith-filled story that introduces children to one of the Church’s most beautiful gifts: plenary indulgences. When Jonah hears about a boy who died suddenly, he begins to wonder if there is anything he can do to help souls who are still being purified. Guided by a devoted parish priest, Jonah discovers a small golden key, an old indulgence manual, and the five “spiritual keys” that unlock the treasury of grace Christ entrusted to His Church. Through gentle storytelling and reverent watercolor illustrations, children learn: what it means to be in the state of grace - how to make an act of detachment from sin - how to choose an indulgenced act (Rosary, Stations of the Cross, Scripture, Adoration, etc.) - the importance of Confession - why receiving Holy Communion is central - and how to pray faithfully for the Holy Father More than a story, this is a practical guide for young Catholics who want to love God, help others, and participate in the Church’s mission of mercy. Perfect for ages 8–12 , sacramental preparation, parish libraries, Catholic schools, and families seeking beautiful, doctrinally faithful books. This touching story invites every child to understand that God can use their prayers, sacrifices, and acts of love to bring souls closer to Heaven — and that this work of mercy is real, powerful, and deeply pleasing to Him.