Hunting the Monster

Background
This quest, given by Gunmar, is a Radiant Story quest and repeats infinitely. It involves killing a Master Vampire in a radiant location.

Walkthrough
Speak to the citizen the objective marker points to. Extract information from them to obtain the Letter from the Vampire that reveals the location of the vampire. Go there, kill the vampire and return to Gunmar.

Possible contacts
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Falkreath

 * Nenya
 * Siddgeir

Dawnstar

 * Fruki

Markarth

 * Hamal

Riften

 * Aerin
 * Haelga
 * Ungrien

Solitude

 * Silana Petreia
 * Vivienne Onis
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Whiterun

 * Acolyte Jenssen
 * Belethor
 * Carlotta Valentia
 * Elrindir
 * Heimskr
 * Jon Battle-Born
 * Olfina Gray-Mane

Windhelm

 * Aval Atheron
 * Susanna the Wicked

Winterhold

 * Birna
 * Kraldar
 * }

Possible locations

 * Ansilvund
 * Bloodskal Barrow
 * Broken Helm Hollow
 * Gallows Rock
 * Greywater Gorge
 * Halted Stream Camp
 * Hob's Fall Cave
 * Hrodulf's House
 * Morvunskar
 * Stony Creek Cave
 * Valtheim Keep

Bugs

 * When arriving at the location of the Master Vampire (after getting the location from the contact), the quest marker may point the Dragonborn to a point on the floor where the Vampire should be, but isn't (reloading a previous save from before entering on 360 (pc unconfirmed) if that doesn't work reload from before obtaining the location of the vampire may fix this bug).
 * After the Stormcloaks have liberated Skyrim, Siddgeir will no longer be Jarl of Falkreath and thus not be there. When he is then chosen as a Contact, the marker will point to some random location, and the quest will be unable to finish.
 * One of the possible locations of the quest target's hideout is Gallows Rock, which is occupied by the Silver hand. Once the Dragonborn enters the keep, members of Silver Hand will attack the vampire, possibly killing it.
 * If Susanna the Wicked is given as a contact after she is dead, it will not be possible to talk to her to find out where the vampire is, making the quest impossible to complete.
 * If Vekel the Man is the contact, and the Dragonborn has already became Guild Master before this quest, after him saying ,,...just please leave me alone!" he will start commenting again on how poorly the Guild is doing (like ,,Been a long time since anyone's joining us. Seems people are in a rush to leave."). If he is asked ,,What's the word around the Guild?", he will say the correct dialogue, though.