A weekend boating party turns into a nightmare for a group of young Londoners when they stumble upon a terrifying secret hidden in the reeds. A weekend boating party turns into a nightmare for a group of young Londoners when they stumble upon a terrifying secret hidden in the reeds. A weekend boating party turns into a nightmare for a group of young Londoners when they stumble upon a terrifying secret hidden in the reeds. A weekend boating party turns into a nightmare for a group of young Londoners when they stumble upon a terrifying secret hidden in the reeds.