When a school child is killed in a botched kidnapping case, a young superhero decides to retire, but her long-lost nemesis reappears–an evil superhero who also happens to be her brother.

I can't seem to grasp what's at stake?
How come he's evil?

Thanks.

What is the forward story? Half the logline is backstory.

What does her Nemesis (Brother) want?
What are the stakes?
What must the lead do to stop him?

Example: "When her evil brother attempts to crash the moon into the earth, a disgraced retired superhero must rally all the meta-humans in order to defeat his dastardly world-destroying plans."