Thirteen-year-old Liam hears something at night-soft tapping sounds in the hallway that no one else seems to notice. His parents brush it off. His friends don't take him seriously. Only Liam feels the dread growing every time the house goes quiet.
When his best friend Sarah stays over to help, she expects to calm him down.
She doesn't realize the consequences her choices might set in motion.
And once you hear it... you never sleep the same way again.