Alastair-Audley Tetralogy Series Novels

An Infamous Army (Alastair-Audley Tetralogy 4) by Georgette Heyer
Regency Buck (Alastair-Audley Tetralogy 3) by Georgette Heyer
Devil's Cub (Alastair-Audley Tetralogy 2) by Georgette Heyer
These Old Shades (Alastair-Audley Tetralogy 1) by Georgette Heyer