This summary is based on the document provided: 1) The document describes a book called "Searching for David's Heart" by Cherie Bennett about a loving sister, Darce, who goes to extreme lengths to find the heart of her deceased brother David that was donated to save another child's life. 2) The book is highly rated 5 stars by Rose Simmons and includes characters like Darce, her brother David, David's best friend Sam Weiss, and the unnamed "Heart Receiver" child who received David's heart. 3) The document promotes reading the full book to find out how far Darce will go to find her brother's heart and how she reacts along the way.