Cress
Cress is stuck on a satellite above Earth. She is Lunar’s secret weapon, an exceptionally skilled hacker and spy, keeping watch on Earth, and ensuring Lunar’s ships aren’t discovered.
Cress falls for Thorne. Both literally and figuratively, after Cinder’s meeting with Cress goes awry. The party split, Cinder and Wolf find Dr Erland; Cress and Thorne land in the Saharan desert; and Scarlet is taken to Luna.
I didn’t enjoy the split party, because it felt a little forced at times. But I did enjoy the story and recommend it.