premise: Dan Brown is an American author with five kids.
hypothesis: Daniel Gerhard `` Dan '' Brown ( born June 22 , 1964 ) is an American author of thriller fiction who wrote the 2003 bestselling novel The Da Vinci Code . Daniel Scott Zahller `` Dan '' Brown ( born May 15 , 1990 ) is an American vlogger and discussion host , under the YouTube alias Pogobat . Inferno is a 2013 mystery thriller novel by American author Dan Brown and the fourth book in his Robert Langdon series , following Angels & Demons , The Da Vinci Code and The Lost Symbol . Robert Langdon is a fictional protagonist of a series of novels , novellas and short stories by American author Dan Brown .