Cubed — Brenna Lyons

On the Earth colony Kielan in the far future, social standing is based on two things, family affiliation and power. All power is psi. Every individual has between five and forty units of psi power, but on Kielan, soulmates and bond-siblings are a way of life. By the science of matches, power increases geometrically by finding pairs destined to you. When Balin Night sub Summer, a member of a bond-mated Trio, finds her bond-sister, a classless waif named Riann, she believes she has completed a bond-mated Quartet. To everyone's surprise, Riann is soulmate to the unmated single of their Trio, Lio. They have formed one of the rare Quatrels, and the untrained Riann is their cornerstone. But there is a secret surrounding Riann. She is a member of one of the four great houses on Kielan and not lowborn as her name would suggest, but how could such a thing occur? It is up to Lio and Talek to solve the mystery of Riann's past and help her find her way as one of the true elite of their world.