SPOILER CENTRALTHE WHOLE STORY.

EPISODE

21. The Undertaking

Finding it difficult to mend fences with Tommy and Diggle Oliver instead focuses on crossing another name off the list. While digging through a crooked accountant's laptop, Felicity discovers a transaction that could help Oliver find Walter. To reconfirm the lead, Oliver gambles that Felicity can be counted on in the field for the first time. In a flashback, Malcolm reveals to Robert Queen and Frank Chen painful details surrounding his wife's murder, and how that shaped his plans for the Glades. Meanwhile, Tommy stuns Laurel with the truth.

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THIS ENTRY’S STORY

Plot summary and ending

Spoilers ahead. Coverage follows the scope labeled below.

Complete story — includes the ending

Oliver tracks down an accountant for the secret organization and steals his laptop. While decrypting it, Felicity uncovers a link to Walter—a money transfer was made to Dominic Alonzo, an underground casino owner who was hired to kidnap Walter. The pair infiltrate the casino and Alonzo claims that Walter is dead. Oliver informs his family and Moira confronts Malcolm, who proves to her that Walter is still alive. Oliver, who was listening in, discovers that Malcolm is heading the secret organization and uses Felicity to ascertain Walter's location. As the vigilante, Oliver frees Walter. Meanwhile, Laurel asks Tommy for the truth about why he left and Tommy states that Oliver still loves her, a claim Oliver confirms. Oliver asks Diggle to help him stop the "Undertaking". In a flashback, Robert is shown disagreeing with Malcolm's proposal, which would involve leveling the Glades with a machine five years hence, killing thousands of people in order to rebuild the area. As a result, Malcolm has a bomb planted on the Queens' yacht, right before Robert boards it for China with a plan to stop Malcolm.

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