They don’t want you to believe what she saw.

Based on the bestselling novel The Woman in Cabin 10 by Ruth Ware. While on board a luxury yacht for a travel assignment, a journalist (Keira Knightley) witnesses a passenger thrown overboard late at night, only to be told that it didn’t happen, as all passengers and crew are accounted for. Despite no one believing her, she continues to look for answers, putting her own life in danger.