Heorot is a short story in the The Dresden Files series by Jim Butcher. It is set between White Night and Small Favor. It was originally published in P. N. Elrond's My Big Fat Supernatural Wedding, and was included in the anthology Side Jobs.
Harry is in his office when he gets a call from Mac McAnally, who needs his help. Mac is at a brewing competiton at Loon Island Pub in Wrigleyville, in sight of Wrigley Field. At the competion, Roger Braddock's newlywed Elizabeth Braddock has gone missing. There is a brief confrontation with the thug Caine, who acuses Roger of steeling his keg of mead. Caine is about to start a fight, but backs down when he realizes that there is a cop nearby.
Harry get's some hair of Elizabeth's comb and uses a tracking spell. Caine still angry at him and jumps him in an alley along with two friends. Harry fends them off using his staff, and with a little help from his dog Mouse.
After the fight, Harry is approached by Ms. Gard, who is hunting the creature that kidnaped Elizabeth. It is called a Grendelkin. Harry and Gard follow the Grendelkin into Undertown. The entrance to the creature's lair is guarded by Malks. Using a glamour and a rune of Routine, Harry, Gard, and Mouse manage to pass the malks undetected. When they get close, Gard charges the Grendelkin. The creature proves to be intelligent and and is a tough opponent who is able to counter both Harry's spells and Gard's skill with weapons. Harry defeats the Grendelkin by casting an illusion to make it look like himself and vice versa, and getting Mouse to lure the nearby malks into the room. They mistakenly attack the Grendelkin, thinking that it's Harry. Harry and Gard collapse the lair with a rune of Sunder and run. After saving Elizabeth Braddock, Harry and Gard have a drink and McAnally wins the brewing contest. Gard reveals that she is a Valkyrie whose name is Sigrun.
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