The bastard and the princess

It is a well known fact that the king of the south have many mistresses.

But very few know that he have a bastard son.

Hidden from the public Tristan is trained as a spy, mastering several languages, material art and a lot of other skills you have yet to discover.

But what happened when he is sent to the Kingdom of the North desqused as a merchant?

And why dose the kings youngest daughter Isobel, look at him like she can see right through him?