(This is just an idea of a story I have. Please don’t use it)

Ok this young adult girl who has supernatural powers. She lost her parents to the ruthless king who eliminates anyone with magical powers. She and her brother are full blooded so they are more powerful than the kids. She has a super mind (mind reading, mind control, advanced intelligence) and her brother has space bending (time manipulation, teleportation). They sail around the kingdom rescuing kids with powers. They use the pirate ships that her grandfather used along with navy skills from her father. Her father was a navy captain before he and her mother were killed. She was safe with her grandparents. When they find out that there are no more kids to rescue (somehow), they now have to take a passage guarded by sirens. In order to pass, they have to give a royal heir to the sirens.  She and her brother then kidnap the youngest brother who is first in line. They sail to the passage and are about to sacrifice the brother when the older brother comes to rescue him. (Idea: her brother acts as help just so the brother comes because she knows about his secret.) Anyway, she tries to use mind control but something blocks it. She then finds out he has the powers to interact with the dead. He is half-blood and finds out his father poisoned his mother. Before he can object, she sacrifices the brother and sails through, taking him prisoner. After she convinces him that they are good, she helps him control his powers. They eventually fall in love and that’s it. Maybe find another problem and cliffhanger.