Is there a secret, fandom-approved 'Marrs-verse' order I don't know about? Like, do any characters have cameos? I swear I read a fan theory once that all his books exist in the same slightly dystopian timeline where technology is always one step away from ruining everything. That would be a wild way to read them—not by publication, but by the in-world timeline of technological advancement.
Probably reading too much into it, but it's a fun thought experiment. Makes me want to re-read them all and look for Easter eggs.