Learn English – What’s the right word for “unclearity”

My dictionary tells me that there is no such word in English. So, what word would you substitute for unclearity below (please, don't change anything else):

— There is still something not clear to me in this business. How do they get their profits back if they themselves never come back?
— Well, this unclearity was in fact the very reason why I decided to call this meeting tonight.