Larian Studios Forums Baldur's Gate III Baldur's Gate III - Help Tips & Tricks Investigate Kagha

I've found the letter about Kagha . I went there and explored the whole area, above and below, and the southern island, but I did not find anything to advance the quest.
How can I advance this quest?

THink there's a perception check at the tree that allows you to find more evidence.

Thank you, found it!