can this make a good story

Its one I already posted and curious if it can work as a long tale of adventure. Its about a boy Prince Richard of Shrewsbury brother of Edward, his brother was killed when they were both in the tower of London. Remember the two young princes that were in the tower. His sister Elizibeth of york refuses to marry Henry Tudor so it falls to Richard to pose as his sister and marry him.
I wrote the brief scene where he travels across the English channel to meet Henry Tudor in person in Bristol before he crosses to defeat the reigning king Richard, wow Richard was a popular name.
His mother Elizabeth Woodville would be in on it once he told her and help her son make a convincing image of his sister for the marriage and being queen.
Someone told me the story just cant be convincing enough :(