On Halloween night in 2004, three roommates passed out candy to trick or treaters at their Napa Valley home before eventually heading to bed in their respective bedrooms. But just a couple hours after falling asleep, someone broke into their home and murdered two of them before running out of the house and out of sight. So, who committed these cold-blooded killings and why? This is the murder of Adriane Insogna and Leslie Mazzara. These are The Napa Halloween Murders.