A unique story told over two distinct halves, "Summer" follows Sam, a man drawn to a mysterious island off the British coast where he encounters a group of islanders set on preserving their traditions at any cost. "Winter" follows Helen, a strong-willed outsider who comes to the island seeking answers, but whose arrival precipitates a fractious battle to decide its fate.

• Jude Law
• Katherine Waterston
• Freya Allan
• John Dagleish
• Mark Lewis Jones
• Börje Lundberg
• Paddy Considine
• Emily Watson