Young married couple Zach and Emmy decide to take a hot air balloon trip across the Italian Dolomites to rekindle their relationship. When they and pilot Harry are joined by a third passenger, Julia, events unfold in ways they could never imagine five thousand meters in the air.

Two estranged siblings must set aside their differences to deal with their mother's death and her hidden past – a journey of discovery that takes them from the Caribbean to London to California and ends with her famous black cake.