Murder's a wild ride! Rosa Reed takes a much needed break from her thriving private investigative work by joining her cousin Clarence and Aunt Louisa for a weekend getaway at the Black Stallion Dude Ranch near Santa Bonita, California. It's the beginning of 1957 and Rosa is ready for a fresh start. Newly single, all she needs is time on the trails, and cuddles from her tabby cat, Diego. The peace and quiet of ranch life is soon disrupted when a horse returns from a trail ride without its rider. When foul play is determined, Rosa finds herself thrust once again into a murder investigation alongside the handsome detective Miguel Belmonte. Suspicion falls on many of the guests-the failed investment banker, the laundromat owner, the heiress, and to Rosa's dismay, her own cousin Clarence. Can Rosa prove her cousin's innocence before the cows come home?