"Estes Park, Colorado, is a place of serenity. But it wasn't always so serene. Shortly after the Civil War, Nathan Kendall and his wife were murdered there, leaving behind a young son. The crime was never solved. Now historian Scarlet Barlow is working at a small museum attached to a B and B, the same building where that murder occurred. She recently came to Colorado, reeling after her divorce from FBI agent Diego McCullough. Diego--who's just been...