Thea (Willa Holland) is in trouble with the police after she gets caught using a drug called "Vertigo." Oliver (Stephen Amell) thinks the only way to keep her out of jail is to find the dealer, a man who goes by the name of "The Count" (guest star Seth Gabel). Oliver turns to McKenna Hall (guest star Janina Gavankar), an old flame and current Vice cop, for help. Meanwhile, Laurel (Katie Cassidy) steps in to defend Thea, and Felicity (guest star Emily Bett Rickards) gives Oliver some disturbing news about Moira (Susanna Thompson).