Sirius Black and Crookshanks' Alliance is Revealed

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Sirius Black reveals that Crookshanks recognized Peter Pettigrew for what he truly was and tried to help Black catch him. Crookshanks even stole the passwords to Gryffindor Tower to assist Black, proving that the cat had been working with him to expose Pettigrew. The revelation shocks the trio as they realize the depth of the conspiracy.