Yee-haw! Mel's out west and murder isn't far behind.
While on vacation with her aunt and Jackie on a dude ranch in South Dakota, a dead body shows up in her room. In an area she does not know very well, it is up to Mel and her friends to solve the mystery. During the investigation, Rachel shows up, and so does the ghost of Jedidiah: a man who died in the late 1800s.
With one turn after another, Mel soon finds herself on a treasure hunt. Can she and her friends solve the murder and find the treasure before the killer finds them?