Number 20 is live here:

DE | https://www.amazon.de/dp/B0FQ51YMTM
US | https://www.amazon.com/dp/B0CYZ2PDZT

Synopsis:

In the secluded silence of a forest cabin, a lonely man takes in a rat – and begins to see in it more than just an animal. But care turns into control, closeness into dependence, and compassion grows into a deadly danger.

The promo runs until Friday, so grab a copy for free now. And please do me a favor, if you liked the story, leave a nice review. Thanks.