The product code you've entered requires ownership of another product before activation.

If you are trying to activate an expansion pack or downloadable content, please first activate the original game, then activate this additional content.

is this maybe a serial for Non-Linear Text Quests - Return of Red Riding Hood Enhanced Edition
https://store.steampowered.com/app/1170100/NonLinear_Text_Quests__Return_of_Red_Riding_Hood_Enhanced_Edition/

I sent you steamgift (Return of Red Riding Hood Enhanced Edition) via Steam..

Key is good.
You will need to first activate Non-Linear Text Quests (free on the store) in order to redeem this key.
Source:
https://www.steamgifts.com/discussion/wwJKW/indiegala-patriotic-detective-bundle