Highlander: The Raven S01E06 - Birthright

Amanda attempts to steal a medallion that was once given to her by a former slave who she befriended, but the job is interrupted by two other thieves who trip the alarm. When one of the thieves turns up dead, only to walk away later, Nick begins to wonder if he's immortal, but Amanda doesn't think so because she didn't detect him. As Amanda continues her search for the medallion, which leads her right to the thief, she finds out what he is really after.