Mina is trying to focus on her job as a flight attendant, not the problems of her five-year-old daughter back home or the fissures in her marriage. But the plane has barely taken off when Mina receives a chilling note from an anonymous passenger, someone intent on ensuring the plane never reaches its destination. Someone who needs Mina's assistance and who knows exactly how to make her comply. It's 20 hours to landing. A lot can happen in 20 hours.... 

Last year, Tom and Caroline Johnson chose to end their lives, one seemingly unable to live without the other. Their daughter, Anna, is struggling to come to terms with her parents' deaths, unwilling to accept the verdict of suicide. Now with a baby herself, Anna feels her mother's absence keenly and is determined to find out what really happened to her parents. But as she digs up the past, someone is trying to stop her. Sometimes it's safer to let things lie....

Louise is a single mom, a secretary, stuck in a modern-day rut. On a rare night out, she meets a man in a bar, and sparks fly. Though he leaves after they kiss, she's thrilled she finally connected with someone. When Louise arrives at work on Monday, she meets her new boss, David. The man from the bar. The very married man from the bar...who says the kiss was a terrible mistake but who still can't keep his eyes off Louise.

Marin had the perfect life. Married to her college sweetheart, she owns a chain of upscale hair salons, and Derek runs his own company. They're admired in their community and are a loving family—until their world falls apart the day their son, Sebastian, is taken. A year later, Marin is a shadow of herself. The FBI search has gone cold. The publicity has faded. She and her husband rarely speak. She hires a PI to pick up where the police left off, but instead of finding Sebastian, she learns that Derek is having an affair with a younger woman. 

In her 20s Emma Blair marries her high school sweetheart, Jesse. They build a life for themselves, far away from the expectations of their parents and the people of their hometown. They travel the world together, living life to the fullest. On their first wedding anniversary, Jesse is on a helicopter over the Pacific when it goes missing. Just like that, Jesse is gone forever.