"The Lightning-Struck Heart" is a fantasy novel by TJ Klune that follows the adventures of Sam, a young man who works as a knight's squire in a magical realm. The story is filled with humor, heart, and romance as Sam navigates the complexities of love and friendship. He has a strong bond with a powerful wizard named Ryan, which complicates matters as they become embroiled in odd adventures and confront various foes. The book is characterized by its vibrant and whimsical world, depicting a universe where magic exists alongside quirky characters. Themes of acceptance, identity, and the importance of chosen family resonate throughout the narrative, making it both entertaining and thought-provoking. As the plot unfolds, Sam confronts his own feelings and learns the significance of trust and loyalty. With its engaging character dynamics and playful writing style, "The Lightning-Struck Heart" captivates readers with its blend of action, humor, and romance in a richly imagined fantasy landscape.