A ghost's antics, a harrowing moose chase, a hypnosis session, and smuggled booze lead to spilled secrets and betrayal, but do they also lead to murder?

At a hot springs retreat in Montana, whiskey-swigging Maude, the nearly eighty-year-old chef, longs for the glory days when the retreat hosted martini-sipping celebrities instead of long-haired hippies who refuse to wear deodorant.

Brooke, feisty, adventurous, and a bit reckless, proposes a reunion at the retreat with her best friends to get away from the chaos of her life with teenagers and the emotional aftermath of her postponed wedding. One of those friends, Tracy, has devoted her life to her children and her husband despite her excruciating boredom. But a long-held secret could cost her the most important friendships in her life.

Haunting the place is a ghost who, in life, dealt with tragedy by turning to prostitution which led to her murder over 100 years ago at the very place they all are staying.

What Happens in Montana explores friendship, betrayal, and forgiveness with blunt truth and witty insights. Together, these friends learn to navigate empty nests, infidelity, deception, and poltergeists. Most importantly, they learn their friendship is strong enough to get them through it all.