Mark Greaney has been at the top of best-seller lists for co-authoring several of Tom Clancy's Jack Ryan novels, as well as writing several Ryan novels after Mr. Clancy's passing. However, Mark got his publishing start with his own original series about burned CIA operative, Court Gentry. Back Blast is the fifth installment in the series, which has Gentry returning to America to find out why the CIA wants him dead.