Gamora arrives on Torndune with a mission: collect the heart of the planet. She doesn't know anything about the mission but as the daughter of Thanos and one of the galaxy's most legendary warriors, her job is not to ask questions. What she doesn't know is that her sister, Nebula, is in hot pursuit. Nebula has followed Gamora to Torndune in the hopes of claiming the planet's heart first and shaming her sister as vengeance for the part she played in Nebula losing her arm. But the closer they get to the heart of the planet—and to each other—the closer they get to uncovering the truth of what brought them there and the role they may unknowingly be playing in a twisted competition with galactic consequences. A competition they can never win ... unless they learn to trust each other. And trust is the biggest lie in the galaxy.