Four friends lose themselves in a carefree South-East Asian holiday. Only three come back. Dave and Alice return home to their young family desperate for answers about Jeremy's mysterious disappearance. When Alice's sister Steph returns not long after, a nasty secret is revealed about the night her boyfriend went missing. But it is only the first of many. Who amongst them knows what happened on that fateful night when they were dancing under a full moon in Cambodia?

Luke welcomes his friend Matt and his girlfriend Suzie that come from London and Matt's sister and Luke's former girlfriend Kate that comes from Sydney to sail with him and the sailor Warren in a sailboat. However, the vessel hits an underwater rock and capsizes with an opening on her bottom. Luke advises that they should swim in the north direction to reach the Turtle Island, in Queensland, Australia, while they have strength since there is a current moving the boat in the opposite direction of land but Warren prefers to stay on the hull waiting for help since there are sharks in the water. The quartet swims, but they are hunted by a great white shark.

Decades after a rock church in communist Romania's Carpathians caved when an expedition caused a landslide and buried everyone, Dr. Nicolai's scientific team exploring the associated Templar Knights monster fighting-legend discovers a deep, flooded cave system and hires the brothers Jack and Tyler's brilliant divers team to explore it. Another explosion traps them, after finding a mysterious parasite turning all species carnivore, and later an independently evolved predator species. Jack may be infected and turning, but Tyler sticks with him, so the group splits, hunted by the monsters, which also fly.

Lovers Ray and Carla plan to burn down her house at Christmas, to run off with her husband's drug money. Ray has a side scheme going too, taking kickbacks on the love hotel project whose construction he's managing. The suburban Aussie marrieds live across a river from each other, the much older, domesticated Ray in a upper middle-class neighborhood, Carla on the wrong side of the water. The cheaters will lure their families to the same Christmas picnic celebration, to provide alibis while still being able to sneak off and chat about the arson. Carla's tow-truck owner hubby, Smithy, is a fearsome tough to cross, so will the philanderers' holiday gifts come through, or explode in their lying faces ?