S3, E3: Oliver decides it's time for Thea to return home to Starling City so he packs for Corto Maltese where Felicity has traced Thea's whereabouts. Lyla (guest star Audrey Marie Anderson) asks Diggle to go with Oliver because one of her field operatives Mark Shaw (guest star David Cubitt) has gone dark in Corto Maltese and she'd like him to look into it. Feeling responsible for Thea's departure Roy joins Oliver and Diggle on their journey. Shaw double-crosses Diggle putting numerous A.R.G.U.S. agents including Lyla at risk. Meanwhile Laurel meets Ted Grant (recurring guest star J.R. Ramirez) and Felicity adjusts to her new job.