The performance by Chloë Grace Moretz is superb and stunning. She is mesmerizing as she portrays the symptoms and struggles that the real Susannah faced. Alongside her, there is a really strong supporting cast including Jenny Slate and Tyler Perry who play her work partner and boss. They do a great job along with her parents, played by Carrie-Anne Moss and Richard Armitage. These characters offer a well-rounded film, allowing Chloë’s performance to shine.