As a story device, use it sparingly. This should not be something which happens on a regular basis. Communication is an absolute MUST between kidnapper and kidnappee, and have a timetable for things to happen. There is nothing worse than having your character get kidnapped and then bring left holding the bag and sitting in limbo for weeks or months if something happens to take your captor away from the game for an extended period of time. Also PLEASE don't assume your target is willing to roll with being kidnapped... please ask first and accept it if the answer is no.
