I'm setting up a scenario (in cooperation with one of my players) to kidnap her character - probably overnight while the others are sleeping at an inn or when they are camping out and it is her turn to stand watch. Four dwarven fighters will recognize her at an inn and follow the party because they want to kidnap her to take her back for a bounty that is on her head.
They need to be able to quietly disable her and tie her up and cart her off, all without waking the rest of the party. I thought about giving them some kind of magic item to do this, but I'm kind of stumped on what that would be. If even so much as one party member hears or sees them, the whole thing will fall apart.
My plan is for them to take her but have the party wake up and follow their tracks and overtake them (they have the means to do that since the dwarves will be on foot). Then have a big fight and rescue her, interrogate any survivors of the dwarves and learn her backstory, etc.
I'm not sure how to do this convincingly. I'm willing to fudge saves and such to make this happen (and the player is as well) but I want what happens to be believable. They party is level 6. I'm open to suggestions/ideas!
Thanks!