Calvin Penney is a kind-hearted but stubborn fisherman living in a small town in Newfoundland. He is still haunted by the mysterious death of his father decades ago. When an unknown sea monster begins terrorizing his hometown, Calvin must fight to keep his close-knit community together. Determined to protect his son Wade and the rest of his family, he teams up with a visiting marine researcher to confront the creature and uncover the island's hidden secrets before it is too late.