'Mother-Daughter Murder Night' follows the story of Lana Rubicon, an L.A. real estate mogul diagnosed with cancer, who retreats to a coastal town with her daughter Beth and granddaughter Jack. The quaint life turns thrilling when Jack discovers a corpse, casting her as a suspect in a murder investigation. Amidst familial strains, the Rubicons are plunged into a mystery entwined with community secrets and land disputes. With their investigative efforts leading them into peril, the tales of conservationists, ranchers, and vendettas culminate in a need for the independent trio to unite against adversity to solve the crime and protect their legacy.