The Quiet Game by Cassandra Hallman

She has no place she feels safe, nobody she can turn to. Until him.
Elisa has always been a quiet person. Staying in the background and observing instead of participating is her safety net. A long time ago, she promised herself not to talk to people unless she has to. Suddenly she finds herself in a dangerous situation she couldn’t anticipate. She is helpless and more alone than ever. Then someone from her past shows up and she realizes that she had never been alone at all.
They lost each other in the past. Now they are fighting for a future together.