That’s what a tipster asked us this morning. So we went to find the answer.

Charlie Gasparino, CNBC’s on-air editor, is taking some time off the air to write a book. Insiders tell us the book is about the banking mess specifically what led to the collapse of investment banks Bear Stearns and Lehman Brothers.

Gasparino is still calling in to CNBC when he has breaking news to report, as was the case last Monday, April 6.

Gasparino has had a few on-air run-ins with his colleagues, including this one with Dennis Kneale last March, this one with Kneale in January, this bizarre exchange in October, and then there was this “F” bomb dropped in January.

Wonder if Kneale will get the first signed copy of Gasparino’s book.