On an early morning in November, a couple boards a private plane bound for Geneva, flying into a storm. Soon after, it simply drops off the radar, and its wreckage is later uncovered in the Alps. Among the disappeared is Matthew Lerner, a banking insider at Swiss United, a powerful offshore bank. His young widow, Annabel, is left grappling with the secrets he left behind, including an encrypted laptop and a shady client list. As she begins a desperate search for answers, she determines that Matthew's death was no accident, and that she is now in the crosshairs of his powerful enemies.