I do not own the book It Ends/Starts With Us, all credits go to Collen Hoover This is who I think who fits the characters very well

Determined to avenge her sisters death, Hayleiah Jay Riley has devoted her life to training with a government agency located in Texas. Every day seems to bring her adversary closer, though its been ten years already. But what will happen when she finally catches her sisters killer? *Disclaimer: I do not own this photo, I only used ot for this cover.*