Journalist and suburban mom Claire Cooper suffers from panic disorder. Most of her anxieties seem irrational, nothing that can't be fixed with the help of some Xanax. But late one stormy summer night, when her husband, Sam, is away on one of his frequent business trips, Claire's fears come to life. She discovers an intruder has broken into her young daughter's bedroom. She watches helplessly as he picks up her sleeping child from her bed. Desperate...