A year after his father's death, Oskar, a troubled young boy, discovers a mysterious key he believes was left for him by his father and embarks on a scavenger hunt to find the matching lock.
The story revolves around the passengers of a yachting trip in the Atlantic Ocean who, when struck by mysterious weather conditions, jump to another ship only to experience greater havoc on the open seas.
Christian Wolff is a math savant with more affinity for numbers than people. Behind the cover of a small-town CPA office, he works as a freelance accountant for some of the world's most dangerous criminal organizations. Christian takes on a legitimate client: a state-of-the-art robotics company where an accounting, has discovered a discrepancy involving millions of dollars. But as Christian uncooks the books and and gets closer to the truth, it is the body count that starts to rise.
Marlo, a mother of three including a newborn, is gifted a night nanny by her brother. Hesitant to the extravagance at first, Marlo comes to form a unique bond with the thoughtful, surprising, and sometimes challenging young nanny named Tully.