R.K. Lilley writes contemporary and erotic romance, best known for the Up in the Air series. In Flight follows flight attendant Bianca Karlsson after she meets hotel billionaire James Cavendish, beginning an intense relationship that continues across several books. The series uses travel, wealth, sexual power dynamics and personal trauma as recurring sources of conflict, with the same couple remaining central rather than changing protagonists each volume. Lilley has also written connected romance series involving other characters and social circles. Her books are explicit, dramatic and strongly relationship-led, fitting erotic romance, billionaire romance and multi-book contemporary series for readers who prefer sustained couple arcs over standalone courtships. Read more Less