What if Betty and Polly cooper had another sister. A sister nothing like the other two. Y/n cooper a girl unlike the rest in riverdale. Growing up with the pressure to be like your perfect older sister and intelligent twin sister made y/n go crazy. Made her feel like she was living under a thumb, if she made one wrong move she'd me crushed like a bug. Growing up with two most amazing friends in the world, Archie Andrew and jughead Jones, made things easier but when one summer tares the group apart makes thing ten times worse and when a boy goes missing and his body is discovered the group must repair and do the job the local police seem to be struggling to do. Come along with y/n cooper and maybe...just maybe, you'll survive.