Cold Skin is a 2017 French-Spanish science fiction-horror film directed by Xavier Gens and based on the 2002 novel of the same name by Albert Sánchez Piñol.^[3][4] The film was released on 20 October 2017 in Spain.

In 1914, a young Englishman travels to a remote island in the South Atlantic to work for one year as a weather observer. The only other inhabitant of the island is the caretaker of the crudely fortified lighthouse, Gruner. Gruner says the previous weather observer died from typhus and there is no body.

After the unnamed man explores the island, he finds the diary of the previous meteorologist with drawings of strange sea creatures. His cabin is then besieged by those creatures at night. The next day he unsuccessfully asks Gruner to let him into the lighthouse. When the night creatures return, he lights a fire, only to burn down his cabin. The next day, he discovers a female amphibious creature outside. Gruner prevents him from shooting her and shows that she is "tame". Gruner gives the man the name "Friend" and he explains the creature will not leave her master no matter how cruel he is.

Friend successfully bribes Gruner into letting him stay in the lighthouse. That night creatures climb the lighthouse, and Gruner butchers them as Friend faints. While defending the lighthouse the following night,Gruner locks Friend outside on the balcony to fight alone, essentially leaving him to die. In the morning, Gruner discovers Friend covered in creature blood but still alive.

The two men settle into a routine. Friend grows to like the captive female creature (treated as a sex slave by Gruner) and names her Aneris. Friend also wonders if the creatures keep attacking because they want to reclaim the female sea creature, who sings during the lighthouse attacks. Gruner belittles Friend's ideas.

One night, the duo come perilously close to being killed when the lighthouse is overrun by the creatures. The following day, Friend tries to signal a passing ship. Gruner attacks Friend and the two men wrestle for control of the flare gun. Aneris tries to protect Friend. Gruner explains to Friend his reasoning for refusing any rescue.

Friend manages to communicate to Aneris that he desires to leave the island. She leads him to an abandoned row boat. Friend and Gruner devise a plan to salvage dynamite from a sunken ship just off shore. The two men row the boat out to the shipwreck. Friend dons an old diving suit and jumps in. Several boxes of dynamite are retrieved, but Gruner does not pull up Friend and stops pumping air to him. Friend escapes from the dive suit and climbs back aboard the row boat, aware that Gruner had once again tried to kill him. Back at the lighthouse, they discover that the recovered dynamite is dry enough to use.

Friend and Gruner form a plan to lure as many sea creatures to the lighthouse as possible before setting off the dynamite, believing that the show of force will kill many and drive them off. The plan largely succeeds, leaving many of the creatures dead or dying. In the morning, Gruner finishes off the remaining creatures. Friend removes a necklace from the neck of one of the dead creatures and once again tries to convince Gruner that the creatures are more civilized than Gruner believes.

Later that evening, Gruner reveals that he found Aneris trapped in his net in the sea and freed her from it. The following night the creatures do not attack, and a great wailing sound comes from the sea. Aneris is missing and appears to have run off for the first time. While Gruner sleeps, Friend discovers a photo of Gruner as a young man with a wife. Friend recognizes the woman in the picture as the same woman seen earlier in a photo belonging to the previous weather observer.

Friend leaves a present for the creatures. He discovers a child creature investigating his present. A more confident Aneris re-appears. Friend tries to tell Gruner that the creatures want a truce. Gruner commands Aneris to return to him but she refuses. Gruner retreats back to the lighthouse where he fires a flare that kills the child creature. Friend finds Gruner inside the light house and the two men fight. Friend tells Gruner he knows he is the previous weather observer and asks him to remember love. Gruner drops his axe, exits the lighthouse, and is killed by the awaiting mob of sea creatures.

Many months later, the next ship arrives to replace Friend. The captain mistakes Friend for the lighthouse-keeper, Gruner, and says they are there to replace the weather observer. Friend tells the captain the weather observer died from typhus, echoing the same lie Gruner told Friend upon his arrival. Aneris watches the scene play out from a safe distance before leaping into the sea and swimming away.

Cold Skin was produced by Babieka Films and Skin Producciones AIE alongside Pontas Films and Kanzaman France with the participation of RTVE and TV3 and backing from ICAA and ICEC.^[5] The sets were designed by Gil Parrondo, to whom the film is dedicated.^[6]

The film was released theatrically in Spain by Diamond Films on 20 October 2017.^[5][7] Samuel Goldwyn Films released the film in the United States.^[8]

Cold Skin has grossed a worldwide total of $737,478.^[2] On review aggregator Rotten Tomatoes, the film holds an approval rating of 48% based on 27 reviews, and an average rating of 6.10/10. The website's critical consensus reads, "Cold Skin exerts a strong visual pull, even if all that icy atmosphere isn't a truly satisfying substitute for a story that dares to go somewhere different."^[9]

David Ehrlich of IndieWire gave the film a 'C+' rating, deeming it to be "a gruesome but uncommonly philosophical creature feature" hinting at "a Lovecraftian ambition that it never fully assumes for itself".^[10]

Dennis Harvey of Variety assessed that the film "offers a good-looking and well-crafted if familiar chunk of creature-siege horror".^[11]

• List of Spanish films of 2017

• Cold Skin at IMDb 
• La piel fría (Cold Skin) at Box Office Mojo