Iron Grip.

Catra is a spy, Adora is a really high ranking member of the rebellion.

In this world there is no magic left. People are experimented on until they either gain miraculous abilities and traits or die. The lucky ones die, and the unlucky ones are out to work by the Horde Empire. Catra is tasked with infiltrating the rebellion along with Double Trouble.
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It's a modern au I guess? I just had a thought and said, "Wow this would be fun" so here we are. Catra is still a magicat (magicat is what Catra is. It's the species she is classified as from the original show) and Adora can still sorta turn into she ra. It's more like she just becomes really strong and stuff.

Anyways, yep.