After declaring war on Hiram, Veronica enlists a secret weapon against her father - her Abuelita. Archie and FP team up to take Dodge down for good, while Betty and Charles investigate a series of strange attacks aimed at Betty. Elsewhere, Jughead's search for his grandpa, Forsythe Pendleton Jones I, leads to more questions than answers, while Cheryl finally makes peace with the past that's been haunting her.

Jughead and Betty confront Bret, Donna and Professor DuPont and unravel their plan to commit the perfect murder.