"There's Someone Inside Your House" by Stephanie Perkins is a young adult fiction novel published by Penguin Young Readers Group in 2018. The trade paperback format features a gripping narrative that combines elements of horror, romance, and mystery, making it appealing to both young adult and adult readers. With a strong focus on social themes, dating and relationships, and school and education, the novel is sure to captivate readers with its thrilling and suspenseful story. The author's engaging writing style and English language make this book a must-read for fans of contemporary young adult fiction.