Moore works with Seattle's Snohomish County Sheriff's Office and takes on her first-ever cold case as a genetic genealogist – the double homicide of Jay Cook and Tanya Van Cuylenborg. The young couple disappeared in 1987 after taking a ferry from Vancouver to Seattle and were later found miles apart, gagged, bound and brutally murdered. With a smattering of clues, but no real leads, the case was cold for 30 years. The episode includes interviews with Jay's parents, Gordon and Leona Cook; Tanya's brother, John Van Cuylenborg; Snohomish County law enforcement retired Sheriff Rick Bart and Detective Jim Scharf; and radio reporter Hanna Scott.