Warren Carroll's 6th History Book on Christendom

Does anyone know if Warren Carroll, author of the A History of Christendom series of books, intends to finish his 6th and final volume of the series? These are the best history books I’ve ever read on the Catholic Church.

I heard he suffered from a stroke shortly before releasing the 5th book in the series The Revolution against Christendom. Carroll is also the founder of Christendom College, a very orthodox and beloved Catholic school to me (I take occasional classes at the grad campus in Alexandria, VA).

I hope he is well, but I can’t find any information on his status or books. Wikipedia mentions the title of the pending 6th volume “Crisis of Christendom”. Anyone a student or friend of Warren Carroll who can confirm the 6th book?

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