In Castle Rock, Maine, seven-year-old Alex Mercer is haunted by a floating Orthodox icon of Saint Nicholas that appears at his window. As he grows, the entity reveals Alex has "the sight," a rare ability to see beyond reality. After a confrontation at an abandoned church seems to end the visits, Alex starts anew in Portland. Twelve years later, the entity returns, forcing Alex and Diane Kowalski, whose family is mysteriously linked to his, back to Castle Rock. Uncovering family secrets, they learn their roles as "Witness" and "Guardian" in facing an ancient consciousness seeking to reconnect with humanity. What began as childhood fear becomes a profound duty that could reshape human perception.
