Vastness of Pace in color

Luke and Melissa, newlyweds, live temporarily in the Provence, France on an assignment from Luke's employer in the States. They live to make each other happy and their life is calm and relaxed.
An invitation to a wedding in Cholet from Melissa's friend seems to be a wonderful opportunity for a relaxed trip through France. A blue-sky day sets a relaxed start to their trip. However, an unexpected traffic jam, an eighteen-wheeler on one side and concrete barriers forcing them to merge into its lane, forgotten wedding clothes, running low on gas late at night high up in the mountains, reckless driving on Luke's part, not merely minor damages to the car, and other incidences turn their life, moods, and emotions upside down. The tension not only tests their patience but their love for each other and their relationship.
What valuable lessons will they learn about themselves and each other? Will this trip, turned chaotic and stressful, emotions flying high, end in separation or bring them closer together?
It seems impossible to mix humour with the high pressure, chaos, and strained emotions; but fasten seat belts and get ready for an exciting ride.