As Long as We Both Shall Live

You can't be married to someone without sometimes wanting to kill them. . . .

After twenty years of running the domestic marathon together - marriage, raising their kids, telling a white lie here and there - Matt and Marie go on a hiking trip to rekindle their romance. They walk along gorgeous trails, stay in snug cabins, and catch breathtaking views from steep mountain peaks.

Only one of them comes back alive.

What secrets were they each hiding? And is Matt a grieving husband or a cold-blooded murderer?