Watch Garage Sale Mystery: The Art of Murder Full Movie Free Online 123Movies. Jennifer Shannon is a garage sale shopping expert whose sharp observation skills allow her to uncover valuable antiques, as well as help her local police department investigate crimes. While arranging a charity garage sale event, Jennifer finds a body in the attic of a local residence. While working to crack the case, Jennifer offers support to her loving husband, Jason, whose upcoming birthday has sparked a mid-life crisis. As Jennifer prepares to buy him the perfect gift, she receives an urgent voicemail from Tina, pleading for her immediate assistance. When she responds, the garage sale-expert-turned-sleuth finds herself standing face-to-face with a killer.