Board Thread:Spoilers!/@comment-2153169-20171129175600/@comment-31937823-20171130005755

DatNuttyKid wrote: If we don't see it in 709, maybe this is the episode where we'll see how Hook's heart was poisoned. And, theoretically by extension, his history with Tremaine. I'm still betting that she's the one who poisoned his heart, not Gothel. Gothel has no reason to A) return to the tower or B) care that Hook is visiting his daughter. Tremaine, however, would be pretty angry if she learned Hook allowed Gothel to escape and is easily vindictive enough to punish him for that even if it's not in a direct manner.

We can see this in Knightfall as that looks to be a Hook centric.