I'm right near Riften and the mission is the steal the horse, frost, and return it to loius letrush.
however, as i was returning the horse i was attacked by some assasins and the horse ran off.
i cannot find the horse anymore, it has not gone back to the black-briar lodge. and louis tells me i need to horse to finish the mission.
what am i to do!!
i dont like having an uncompleted mission in my quest log!

Thanks!!