"The Companion" by Katie Alender is a thrilling and suspenseful YA novel that keeps you on the edge of your seat from beginning to end. The story follows a teenage girl named Margot who takes a job as a companion to a wealthy family's young daughter, Agatha, on a secluded island. As Margot begins to unravel the secrets of the island and the family she is working for, she realizes that she may have gotten herself into more trouble than she bargained for. Alender does an excellent job of building tension and creating an eerie atmosphere throughout the book, and the plot twists and turns will keep you guessing until the very end. The supernatural elements in "The Companion" play an important role in the plot and contribute to the overall atmosphere of suspense and unease. Alender creates a sense of foreboding throughout the book, and the supernatural elements add an extra layer of mystery and intrigue to the story. Overall, "The Companion" is a great read for anyone who enjoys a good mystery with a touch of the supernatural.