Escorting Ireena Kolyana

Ismark Kolyanovich asks for their aid in protecting his adopted sister, Ireena Kolyana. 
If they agree to help, he asks them to meet him at the burgomaster's residence (area E4).  He wants the characters to help him escort Ireena to Vallaki,  a settlement in the heart of the valley, beyond the view of Castle Raven loft and (he hopes) beyond the reach of Strahd. Ismark knows that moving Ireena is a gamble,  since she's vulnerable to Strahd when she is outside their home,  but he has heard assertions that Vallaki is well defended. Ismark is as tight-lipped as any of the other Barovian villagers, unless the talk deals with Ireena or Strahd. Ismark knows everything the other villagers know. He also knows that, for some unknown reason, Strahd is attracted to Ireena and desires her above all others.
Ismark has spent most of his adult life training with weapons in the hope of one day confronting and killing Strahd. If the characters suggest that he accompany them, Ismark agrees provided that Ireena is first taken to a place of safety. As long as Ismark accompanies the characters, he acts as a party member for the purpose of determining each character's share of experience points (though he gains no experience points himself).