42°58′57″N 70°36′25″W﻿ / ﻿42.98250°N 70.60694°W﻿ / 42.98250; -70.60694
 Smuttynose Island (formerly "Smutty-nose") is a 27-acre island in the Isles of Shoals, a group of small islands and tidal ledges located 6 miles (10 km) off the coast of New Hampshire and 7 miles (11 km) off the coast of Maine,  United States. Smuttynose and some of the other islands in the Isles of Shoals are part of the town of Kittery in York County, Maine. 
 The island was named by fishermen who thought the profuse seaweed at one end made it look like the "smutty nose" of some vast sea animal.
 Smuttynose Island is the source of the name of the Smuttynose Brewing Company of Hampton, New Hampshire.
 The island is best known for the Smuttynose murders (also known as the Isles of Shoals murders), a sensational crime which occurred on March 6, 1873.
 Three Norwegian immigrant women (Maren Hontvet, her sister Karen Christensen and their brother's wife, Anethe Christensen) were alone overnight in the only occupied house on the island, which belonged to Maren and her husband John. Shortly after 1 a.m., the three women were awakened by an intruder who beat and strangled Karen to death and used the Hontvets' own axe to kill Anethe. Maren was able to escape through a window and hid among rocks until daybreak, when she made her way over a breakwater and signaled to a neighboring island for help.
 Maren Hontvet identified Louis Wagner, a German-born fisherman who had once worked on her husband's fishing boat and been a boarder in their home, as the killer.
 In addition to Maren's eyewitness identification, there was a great deal of circumstantial evidence against Wagner:
 Wagner was tried, convicted and (after briefly escaping) hanged for the crime by the state of Maine on June 25, 1875. While awaiting execution, he told visitors that Maren herself was the real killer and her husband had paid witnesses to frame him for the crime. Some found his professions of innocence so compelling that they came to believe he was not guilty.
 An axe said to be the one that Wagner used to kill Anethe Christensen is on display at the Portsmouth Athenaeum.
 Writer Celia Thaxter, a resident of neighboring Appledore Island who had employed Karen Christensen at her island hotel until shortly before the murders, published an account of the crime in Atlantic Monthly magazine in 1875 titled A Memorable Murder.
 John Perrault, poet laureate of Portsmouth from 2003 to 2005, first heard the story of the murders from Celia Thaxter's granddaughter in the early 1970s. He composed a murder ballad about the crime titled The Ballad of Louis Wagner and released it on his 1981 album New Hampshire. 
 J. Dennis Robinson recounted the crime and the evidence against Louis Wagner in his 2019 book Mystery on the Isles of Shoals: Closing the Case on the Smuttynose Ax Murders of 1873, in which he concluded that there was overwhelming proof the correct person had been executed for the murders. Among other evidence, Robinson pointed out that Maren named Wagner as the killer immediately upon being rescued from the island early the next morning and that if she had been lying, she would have been taking a great risk of her story being exposed, as she had no way of knowing how many people might have seen him on the mainland at the time of the murders. 
 Anita Shreve fictionalized the story of the murders in her 1997 novel The Weight of Water, in which she depicted Maren as the killer. It was later made into a film of the same name starring Sean Penn and Elizabeth Hurley.
 The murders were also featured on the Strange and Unusual Podcast, episode 11, titled "Wolf in Sheep's Clothes".
 
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