Let's play Thief fan missions: A Midsummer Night's Heist, episode 1
Channel: vfig
Date: 2021-09-14

There's a priceless topaz called the Lion's Fury. Other thieves have tried to steal it and failed, and its owner, Sir Vasko, has hired Mechanists to increase security even more. To Garrett, that's a challenge...

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A Midsummer Night's Heist is a Thief 2 fan mission by skacky. Find more details and the download at TTLG – https://www.ttlg.com/forums/showthread.php?t=151011

I recommend getting Thief 2 from GOG – https://www.gog.com/game/thief_2_the_metal_age – which is already patched to NewDark 1.26. Newer missions might require NewDark 1.27, you can use T2Fix Lite to patch it – https://www.ttlg.com/forums/showthread.php?t=149669