Nadia's Heart Part One by Wendy Altshuler
Approx. 34,010 words.
Published on July 9, 2012.
When an amnesiac girl who thinks she has been born without a heart utters a prayer, she is met by a mysterious angelic stranger from her forgotten past. Together they embark on a journey to recover her removed heart, but enter into battle with an Evil Voice on a rampage to remove the hearts of an entire generation of children.