Final Summer follows a group of camp counselors who return to Camp Redwood, 10 years after a tragic incident occurred there. When they arrive, they discover that the camp is still haunted by the memory of the tragedy, and they begin to experience strange occurrences.
As the counselors begin to prepare for the camp's opening day, they are stalked and killed one by one by a masked assailant. The killer seems to have a vendetta against the group and is specifically targeting them for revenge.
As the body count rises, the remaining counselors must band together to survive and figure out who the killer is before it's too late. Along the way, secrets are revealed, and old wounds are reopened, adding to the already tense atmosphere.
As the counselors race against time to survive the final summer at Camp Redwood, they discover that the killer is someone they never suspected, and the truth behind the tragedy that occurred 10 years ago is more shocking than they ever imagined.