This mod was originally created and uploaded by Jeka215 back in 2011. Original author left full permissions, so I decided it's high time to give this nice quest mod another chance to be noticed by a foreign audience. 

WHAT TO EXPECT
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1) 3 new interconnected quests that tell the story of Vault 104 (around 1-1,5 hours to complete all objectives);

2) New vault for you to explore and uncover story behind another Vault-Tec experiment;

3) Custom Vault 104 Jumpsuit;

4) Optional system for preparing different dishes using more than 10 new recipes;

5) Option to get new "creature" companion (don't want to spoil it);

6) Intense combat sequences with dozens of feral ghouls;

7) BONUS: I didn't cut original Russian voice lines of Katie. 

HOW TO INSTALL
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Original creator left full permissions for this mod, so you'll only need files from this page.
1) Place the .esm and other folders in the Data directory of the game 
2) Activate Vault104 ESM file and run the game.
OR
1) Just use Vortex installation path and activate plugin.

Also you can find translated ReadMe file and OPTIONAL PLUGINS in the main archive:
1) BobikHelp - This optional plugin adds the ability to give some of your equipment to Bobik's "storage" inventory;
2) Hardcore -  This plugin will make the quest more difficult by replacing most of the ghouls in Vault 104 with a more dangerous type of ghoul; (Broken Steel DLC is required)
3) KatyRebuild - This option radically changes Katie's appearance: she changes her face and hairstyle (included) and clothes (from The Pitt DLC). (The Pitt DLC is required)
4) KatyReplace - In case you have already destroyed Megaton, this option will move Katie to Canterbury Commons.

HOW TO START
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You need to find new NPC named Katie in Moriarty's Saloon in Megaton. She will ask you to help in finding any information about Vault 104. 
Again, If you blew up Megaton, activate the optional plugin KatyReplace.
The following 2nd and 3rd quests will activate automatically upon reaching a certain point in the story of this quest mod.

BUGS AND CONFLICTS 
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No game breaking problems were encountered in my play-testing sessions.
This mod has some "rough edges" in terms of editing some vanilla aspects. Unfortunately I don't have enough time to fix every small problem right now, but the quest itself is fully playable from start to finish.

CREDITS
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All rights and praises to original creator -  Jeka215.
I just wanted to translate and share his creation with bigger audience.