Entangled - From a Zoella Book Club 2017 author

Real, compulsive and intense: Cat Clarke is the queen of emotional suspense. For fans of Paula Hawkins, Gillian Flynn, Megan Abbott and Jandy Nelson. Seventeen-year-old Grace wakes up in a white room, with table, pens and paper - and no clue how she got there. As Grace starts writing, pouring her tangled life onto the page, she is forced to remember everything she's tried to forget: falling hopelessly in love with Nat, and the unravelling of her friendship with her best mate Sal.
But there's something missing. As hard as she's trying to remember, is there something she just can't see? Grace must face the most important question of all. Why is she here? A compulsive thriller of dangerous secrets, intense friendships and electrifying attraction.