Calvin Penney is a big‑hearted but stubborn fisherman, living in a small Newfoundland town, who is still haunted by his father's unexplained death decades ago. When a mysterious sea creature begins terrorizing his hometown, Calvin must fight to hold his close-knit community together.

Determined to keep his family safe, he teams up with a visiting marine researcher to confront the creature and attempt to reveal the island's buried secrets before it's too late.