What was the name of the adoption Agency Jonah came from?

Part One of the book Found by Margaret Peterson Haddix features a thirteen year old boy named Jonah. Jonah has always been aware that he was adopted and it has never seemed like a big deal to him. That is until he and his new friend Chip who is also adopted start receiving mysterious letters. Thus starts the mystery that is central to the book.

Jonah was adopted from a place called Hope for Children Adoption Agency. Soon Jonah and Chip discover that they are caught in a battle between two opposing forces that want two very different things for their lives.