crossing the line AU

"I'm starting to question if we met... On purpose. Through Fate... Or whatever."

Crossing the line - A story about two girls who were almost swapped at birth, you could say...

Cassandra grew up in a castle, money and power galore. She was raised by the king and queen as if she was their own child... Because, I suppose, she kind of was.
Rapunzel, on the other hand, was raised up in a secret tower, sheltered from the outside world, protected by everything and anything.

Cassandra and Rapunzel both want different paths in life.
Cassandra wants to fight and serve on the gaurd, and Rapunzel wants to escape and explore the world that she was deeply deprived of.
Both will eventually get what they've been wishing for, but not without bumping into each other along the way...

The question is... Will they realise they've both been living the others life?