Grimm Season 1 Episode 13

A failed jewelry store robbery results in a murder that finds Nick and Hank immersed in a hunt for rare coins. Nick soon learns that these coins have an unsettling effect on whoever possesses them, as Hank and Captain Renard begin to exhibit unusual behavior. Meanwhile, a mysterious old friend of Aunt Marie's (guest star Titus Welliver, "Lost") comes to Nick with information about his family and what led to his parent's death.