"The Watcher" is an American detective thriller series about a mysterious stalker. A young married couple with two beautiful children move into a new home. All family members are convinced that a peaceful and happy life awaits them here, and past problems and arguments will be left behind. However, their idyll is disrupted by strange messages that the spouses begin to find under their door. Someone sends them threatening letters, signing them with the name "The Watcher". With each passing day, the danger becomes more palpable.