I just finished the Trade Pacts science fiction series by Julie Czerneda. The premise is that there is an adjacent reality called the mirror. It’s kind of like subspace or hyperspace in that it can be used, nobody lives there and it has it’s own physical laws. Beings that can access the mirror have abilities that we’d think of as paranormal. The universe has humans, a small number of humans with the ability to access the mirror and various alien species which may or may not use the mirror. The books focus on the Clan, a human-looking species with access to the mirror.
