On a plane to Barbados, nurse Melissa sits with her young son, Theo. On the same flight, up in first class, are a bride- and groom-to-be, heading for their tropical wedding destination, accompanied by family and friends.   When two members of the wedding party die in mysterious circumstances, it becomes clear that a killer is on board. Trapped in the cabin thousands of feet above the Atlantic, tensions mount as accusations fly—and when little Theo seems to vanish into thin air, this bizarre flight becomes even more turbulent . . .   Will Melissa be able to use her medical knowledge to find her son and bring a cold-blooded killer to justice before it’s too late?