How to complete the Free the Artist quest in Baldur's Gate 3

The Baldur's Gate 3 Free the Artist quest is one you encounter quite early in the game if you find the hidden Zhentarim Hideout and the kidnapped artist, Oskar Fevras, that they're holding. While you can free Oskar there and then, his quest won't pick up again until Act 3, where you'll have to help him and his new wife, Lady Jannath, deal with a haunting at her estate...
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