Complete story — includes the ending
The events of how Robert, the father of David and James, was murdered are detailed in a flashback, in which Robert learns what happened to James after he ran away from King George. With help from Rumple, he tracks him to Pleasure Island, but their reunion is cut short by King George, who orders Robert's execution. His death affects David in the present day after he sees visions of Robert and asks Hook to help him, despite his being reformed. When Hook becomes concerned that David is taking this investigation too far by going after Albert, he intervenes and brings David back to sanity. Hook is also worried about whether David will give him his blessing to marry Emma, but David does. Meanwhile, Regina tries to get the Wish Realm Robin assimilated into Storybrooke, but soon questions why he agreed to follow her, as it turns out that he had something else planned after he steals a chest from the vault. The truth as to who really murdered Robert is revealed when August gives Hook missing pages he took from Henry's book. When Hook sees an illustration of David's dad, he recognizes him and recalls murdering him during a robbery in the Enchanted Forest so that there was no witness to his crime.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Once Upon a Time season 6. HTML formatting and reference markers removed. · Content license