What is a brief summary on the book heartbeat?

"Heartbeat" is a novel by Sharon Creech that follows a young girl named Annie as she navigates different aspects of her life, including her passion for running and her relationships with her family and friends. Through Annie's eyes, the book explores themes of family, love, loss, and the power of resilience and determination. It is a heartwarming story that beautifully captures the emotions and experiences of adolescence.