Oliver (Stephen Amell) encounters a mysterious woman, Helena Bertinelli (guest star Jessica DeGouw), daughter of mob boss Frank Bertinelli (guest star Jeffrey Nordling), who he can finally be himself with, but he soon comes to realize she's hiding dangerous secrets of her own. Helena is on her own personal mission of vengeance and Oliver is caught in the middle. Meanwhile, Tommy (Colin Donnell) is blindsided by an unfortunate turn of events and turns to Laurel (Katie Cassidy) for support.