From amazon.com:

The scions of a falling house must navigate a world of corporate warfare to maintain their family's status in the moon's vicious political atmosphere.

The moon wants to kill you -- whether it's being unable to pay your per diem for your allotted food, water, and air, or just getting caught up in a fight between the moon's ruling corporations, the Five Dragons. You must fight for every inch you want to gain in the moon's near-feudal society. And that is just what Adriana Corta did.

As the leader of the moon's newest ''dragon,'' Adriana has wrested control of the moon's helium-3 industry from the Mackenzie Metal Corporation and fought to earn her family's new status. Now, at the twilight of her life, Adriana finds her corporation, Corta Helio, surrounded by the many enemies she made during her meteoric rise. If the Corta family is to survive, Adriana's five children must defend their mother's empire from her many enemies -- and each other.

From audible.com:

Corta Hélio, one of the five family corporations that rule the moon, has fallen. Its riches are divided up among its many enemies, its survivors scattered. Eighteen months have passed.

The remaining Hélio children, Lucasinho and Luna, are under the protection of the powerful Asamoahs, while Robson, still reeling from witnessing his parents' violent deaths, is now a ward - virtually a hostage - of Mackenzie Metals. And the last appointed heir, Lucas, has vanished from the surface of the moon. Only Lady Sun, dowager of Taiyang, suspects that Lucas Corta is not dead - and that he is still a major player in the game. After all, Lucas always was the schemer, and even in death he would go to any lengths to take back everything and build a new Corta Hélio, more powerful than before.

But Corta Hélio needs allies; and to find them the fleeing son undertakes an audacious, impossible journey - to Earth. In an unstable lunar environment, the shifting loyalties and political machinations of each family reach the zenith of their most fertile plots as outright war erupts.

From audible.com:

The continuing saga of the Five Dragons, Ian McDonald's fast-paced, intricately plotted space opera pitched as Game of Thrones meets The Expanse

A hundred years in the future, a war wages between the Five Dragons - five families that control the moon's leading industrial companies. Each clan does everything in their power to claw their way to the top of the food chain - marriages of convenience, corporate espionage, kidnapping, and mass assassinations.

Through ingenious political manipulation and sheer force of will, Lucas Corta rises from the ashes of corporate defeat and seizes control of the moon. The only person who can stop him is a brilliant lunar lawyer: his sister, Ariel.

Witness the Dragons' final battle for absolute sovereignty in Ian McDonald's heart-stopping finale to the Luna trilogy.