“Carla and me”, actually. Yes, it’s most correct to put the personal pronoun last, but you don’t switch from the objective to the subjective just because there’s another person involved.
In other words: It’s “narrated by me” not “narrated by I”, so “narrated by Carla and me” is correct.
More importantly, go get the book! walker (nprofile…snpy) is an amazing narrator and I can’t wait to hear his work with CARLA (nprofile…0y2e) .