The experiments (not a chapter)

This is my english assessment I decided to make it into a story.

Lilith had been missing for 10 years she was kidnapped on her way home from school. Soren was missing for 84 days he was kidnapped while going to the shops. They are two entirely different people, but they were both taken and used for human experiments to apparently protect the people of the world from anything. Lilith was turned into what was the definition of a Demon, all the powers and looks but her polar opposite Soren was made to an Angel. Can these two work together to get out of the hell they had to suffer for so long.