The Last Girls

On a beautiful June day in 1965, a dozen girls-classmates at a picturesque Blue Ridge women's college-launched their homemade raft (inspired by Huck Finn's) on a trip down the Mississippi. It's Girls A-Go-Go Down the Mississippi read the headline in the Paducah, Kentucky, paper.

Thirty-five years later, four of those "girls" reunite to cruise the river again. This time it's on the luxury steamboat, The Belle of Natchez, and there's no publicity. This time, when they reach New Orleans, they...