There are 3 books in the Headshot Online series. The newest book is Three in the Heart which came out in 2020.

1
One in the Gut

Book cover of One in the Gut
Every week, I rise from the dead...Headshot has just gone live and the whole world's playing the new Artificial Reality blockbuster. Unfortunately, unless you can buy your way onto the Survivor's side, you can only participate as a Zombie. Each week, the forces gather to tear each other down to…
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2
Two in the Head

Book cover of Two in the Head
Outlasting the Apocalypse was only the beginning...Ryan's week of digital mayhem succeeded in he and Sasha bringing Headshot to its knees, crippling the game, and ruining the highly anticipated launch. But Deep Dive is now aware of his interference and will stop at nothing to end his involvement once and…

3
Three in the Heart

Book cover of Three in the Heart
If you keep a monster as a pet, don't lose your grip on the leash...Captured by Deep Dive and broken by the nefarious Desmond, Ryan has become a weapon. Headshot's developers use him to destroy their competitors, and along the way the enthusiastic gamer almost loses himself in a web…