Harry Styles and Louis Tomlinson are best mates, best mates and nothing more. Louis is dating Eleanor, and the thought of them together makes Harry sick. Harry would do anything to win Louis over, but Louis remains completely oblivious to Harry's feeling. But when Harry starts getting mysterious headaches how will it affect the band and how will it affect Louis and Harry's relationship? Why is Harry keeping secrets from everyone? Are the headaches more than minor annoyances?