Fantastic Beasts: The Secrets of Dumbledore can finally reveal Harry Potter's darkest mystery surrounding Albus Dumbledore's (Jude Law) sister, Ariana. The third Fantastic Beasts movie will see Aberforth Dumbledore (Richard Coyle) reunite with his older brother Albus, who is rallying everyone around him (including Eddie Redmayne's Newt Scamander) in his war against his friend-turned-foe Gellert Grindelwald (Mads Mikkelsen).
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