Gwen Tozier always had a sinking feeling that something was off in the small town of Derry. So when her younger brother and his close group of friends tell her an evil entity in the form of a clown is the one responsible for all the deaths and missing kids, she believes them. She finds out for herself though just how real this clown is and what IT wants from her.

There was a reason why the dark crimson hair and skillful artistic fingers drew the attention of a certain creature that dwelled in the sewers to her. While she was trying to live a normal life, trying to adjust being the new kid, and trying to look out for her little brother, Ben Hanscom, she was feeling the sense of eyes on her. Something was watching her every move.