Give Me Your Hand by Megan Abbott

Kit Owens dreams of a prestigious career as a scientist. When the project of her boss, Dr. Severin, is funded, Kit is hopeful that she will win one of the two spots on the team. However, when old friend and sort-of rival Diane Fleming joins the lab, Kit knows her chances have gotten slimmer. Seeing Diane again brings back memories of when Kit and Diane first met as teenagers and Diane shared an awful personal secret with Kit--a confidence that Kit wishes never happened and that has haunted her ever since. Soon, Kit finds her future entwined in Diane's in the worst way possible. Give Me Your Hand is a dark story of competition and success.