At Tor.com she tagged her five favorite science fiction and fantasy novels that feature interesting, powerful friendships, including:
Archivist Wasp by Nicole Kornher-StaceRead about the other entries on the list.
This post-apocalyptic ghost story grabbed me from the first page. The titular character agrees to travel to the underworld to help the ghost of a super-soldier find the spirit of his lost colleague and friend. The story and emotional bond between the ghost and his friend is played out in pieces of memory, and the glimpses of that relationship and their history are every bit as compelling as the surreal underworld through which Wasp and the ghost travel to find her.