An engaged couple's backpacking trip in the Caucasus Mountains is derailed by a single misstep that threatens to undo everything the pair believed about each other and about themselves.An engaged couple's backpacking trip in the Caucasus Mountains is derailed by a single misstep that threatens to undo everything the pair believed about each other and about themselves.An engaged couple's backpacking trip in the Caucasus Mountains is derailed by a single misstep that threatens to undo everything the pair believed about each other and about themselves.