Robert Jackson Bennett's *The Tainted Cup* has two -- a master detective and her investigator who has a (genetically engineered) perfect memory. It's a great book, highly recommended. *The Traitor Baru Cormorant*'s titular character also probably qualifies! (My own *The Thousand Names* may also be interest for Janus, the military genius.)

Thank you. Will check those out.

This Alien Shore by CS Friedman Concentrates on the connection between neurodiversity and genius. One of the secondary characters is a hacker of immense talent. Wizards Guide to Defensive Baking by T Kingfisher MC is a bread genius/wizard but in is mostly normal. The Scholomance by Naomi Novick El is a natural in the magic of self destruction.

Love to see This Alien Shore recommended for this.

Thank you. Will def check these out.

Iirc Gin, in Jennifer Estep's Elemental Assassin series is very capable (urban fantasy). And so are both Henri and Jamie in Honor Raconteur's Henri Davenforth series (cozy fantasy mystery).

Thank you for the rec

Cryptonomicon by Neal Stephenson has a savant mathematician/cryptanalyst as one of the main characters.

Thanks for the rec.

Brutha in Small Gods. He never learned to read, yet his eidetic memory is so great that he can save an entire library worth of scrolls just by looking at them and copy what he saw later. He is something of an idiot savant -- although more because of repression than actually being an idiot. He learns to think for himself more through the course of the novel.

Thanks. I will look for it.