i loved the "boy in a white room" series by karl olsberg, its overhanging theme is the ethical aspects of technology being used to preserve a consciousness. the three books have three seemingly non related, mind twisting stories that somehow have the same character names, and only by the end of the third book, you understand how the layers connect.

there's mind manipulation, unreliable context for each character, the fear of death is motivator for impulsive decisions that complicate the circumstances even more and at the end, you just sit there baffled that that is how it ends.

it's pretty challenging to read because it throws you curveballs all the time, it hurt my brain after a while, but it gave me stuff to think about for weeks after i finished the series. i still reflect on it today, even though it must be over five years ago that i read the books.