Since several authors have used this title, you should check these platforms to ensure you get the specific version you are looking for:

These are community-driven libraries where you can often find various editions, though availability depends on current copyright status. Quick Summary of Popular Versions

The most reliable official source for ebooks. It provides high-quality FB2 files and supports the creators.

Deep down, we read these to see if the "stray" can ever return home, or if they must build a new home in the dark. Where to Download (FB2)

Focuses on mental health, trauma, and the search for identity.

A popular hub for Russian-language indie authors. You can often find "Заблудшая душа" here for direct download in FB2 format if the author has enabled it.