Oliver and Roy track down the home of Digger Harkness, a boomerang-wielding murderer, but they only find A.R.G.U.S. operatives looking for the same man. S.T.A.R. Labs' Dr. Caitlin Snow and Cisco Ramon arrive in Starling City to help Felicity analyze DNA from the arrow that killed Sara. Digger attempts to kill Lyla; Roy and Oliver arrive to stop him, but need assistance from Barry Allen, who uses his super speed to stop a couple of boomerangs from killing Oliver. Later, Lyla reveals Digger was part of the Suicide Squad, and Oliver agrees to allow Barry to assist in the investigation. Oliver's interrogation tactics lead Barry to question how emotionally stable Oliver is. The team track Digger's location, but it turns out to be a ruse that allows Digger to trace their hideout, where he wounds Lyla before being forced to run away. In order to escape, Digger plants 5 bombs around the city. While Oliver captures Digger, Barry uses the rest of the team to defuse the bombs at the same time. Flashbacks to Hong Kong show Oliver learning how to torture suspects effectively to get information.
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