SOLVED. YA Action book about a supersoldier-esque teenage(?) boy named after a card (e.g., nine of spades). [s]

[Em]

I think I would've read this book around 2010-2013, though I think it was older. The main character was a boy who was either created in a lab or had been trained his whole life to be some kind of supersoldier/assassin, and he was named after a card (something like "Nine of Spades"). I think memory loss was involved, but I may be conflating two books with that. If I recall correctly, the ending set the book up for a series with something along the lines of finding the others who had also been named after cards. I wish I could remember more of the plot, if it helps I think it had a similar feel to the Alex Rider books by Anthony Horowitz.

[Capn]

The Lab of the "Agent Six of Hearts" series?

It was just recently in an active thread: https://www.goodreads.com/topic/show/...

[Em]

Oh I believe that’s it, thanks so much!

[Capn]

:)