Vicious (Villains Book 1) by V. E. Schwab is currently only $1.99 everywhere. It's a great series of a very unhealthy relationship between two men who realise they can create people with extraordinary powers, with terrible consequences.
https://www.amazon.com/Vicious-Villains-Book-V-Schwab-ebook/dp/B00CQY7WBI/

#booksale @bookstodon