Worst Sellers

Four authors who find themselves heading for the Worst-Seller List get together and make an appointment with a literary agent.  He asks about their work.   However, the novelists always lie and the non-fiction writers always tell the truth.

Andi replies, "All of us are novelists."  Baye says, "No, only three of us are novelists."   Chaz says, "No, only two are novelists."   Dray says, "No, only one is a novelist."  Who writes what?

Source: Parade, Ask Marilyn, Nov. 15, 2009