Stars Above is a collection of 9 stories from the Lunar Chronicles:

The Keeper - A Prequel to the Lunar Chronicles, Scarlet’s childhood and Michelle Benoit’s part in taking care of Princess Selene.

Glitches - A Prequel to Cinder, Cinder’s first few weeks after her cyborg surgery and her meeting her stepfamily. 

The Little Android - A Prequel to Cinder, a retelling of Hans Christan Anderson’s “The Little Mermaid”.

The Mechanic - A Prequel to Cinder, when Cinder met Kai from Kai’s perspective.

The Queen’s Army - A Prequel to Scarlet, the story of a soldier's struggles and journey in Levana’s army.

Carswell’s Guide to Being Lucky - A Prequel to Cress, a backstory on Thorn set seven years before Cinder.

After Sunshine Passes By - A Prequel to Cress, how Cress got sent alone on the satellite spying on Earth for Luna.

The Princess and the Guard - A Prequel to Winter, the friendship between Winter and Jacin, also answering questions about Winter’s past.

Something old, Something new - An epilogue to Winter, where they have a wedding set two years after Winter.

In Stars Above, you get to know a bit more about each of the characters, and some secondary characters too, through backstories and events told in different perspectives. I liked this collection of short stories, they were written well, catching your attention on page one and throughout the book. I would recommend this because it was a fun read, people who have read the Lunar Chronicles and like sci-fi would enjoy this book. If you liked the Lunar Chronicles series, this would be a great next read.