On a snowy day in February 1977, Leslie Guthrie left her home in suburban New York in a car with her two small children, only to never be seen again. Leslie's family says just before they disappeared, Leslie was having problems in her marriage. Could Leslie have taken Julie, 6, and Timmy, 3, and started a new life? Could they have joined a cult -- something Leslie had been reading about? Could their car have gone off the road and sunk deep to the bottom of one of the many murky bodies of water surrounding her house? Leslie's family and Tim Guthrie Sr., Leslie's husband, have gone in circles for decades trying to answer those questions. Reporter Kristin Thorne investigates this heartbreaking and mysterious cold case.