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Ihnen
(personal pronoun) (dative) (sing.) (Sie)
you; to you; at you; for you; from you; yourself [formal]
If a part of the sentence is on the receiving end of the direct object in the sentence (eg; hearing the truth / getting a gift), then it is what we call the 'indirect object'. The indirect object always goes in the dative case. Dative pronouns can also be used to replace the need for a preposition. (eg; to run away FROM someone)