Credit: Megan Gunter; St. Martin's Griffin Courtney Summers continues to build up her YA institution, and her latest edition (on shelves now) follows in her footsteps of eerie, unsettling — and unputdownable — novels. New York Times bestseller Sadie, centers around a pair of sisters after the death of their parents. Protagonist Lo is in the care of their aunt, while Bea finds herself caught up ( very caught up) in The Unity Project, a cult-like community in upstate New York. The narrative force of The Project follows Lo in her attempts to unbury the group's secrets and extricate her sister from the leader's clutches. Here, Summers answers EW's burning book questions about what started her on the writing path and her experience writing her latest thriller.