At the 25th Annual Gilbert family reunion, siblings Gil, Dil, and Lil compete for the coveted Gilbert Cup.

A couple spend their honeymoon in a cabin on a small island in the middle of a forest lake. There's no power nor cellphone connection. He starts behaving strange, not letting her leave the island. She can't swim.

Fin and April are on their way to New York City, until a category seven hurricane spawns heavy rain, storm surges, and deadly Sharknadoes.