Wonder Woman by Leigh Bardugo (click on the title to preview the book)
Diana, Princess of the Amazons, longs to prove herself to her warrior sisters. When the opportunity comes, she throws away her chance at glory and breaks Amazon law to save a mere mortal. Alia Keralis just wanted to escape her overprotective brother with a semester at sea. When a bomb detonates aboard her ship, Alia is rescued and forced to confront a horrible truth: Alia is a Warbringer– a direct descendant of the infamous Helen of Troy, fated to bring about an age of bloodshed and misery. If they have any hope of saving both their worlds, Diana and Alia will have to stand side by side against the tide of war.