Are you considering Bad Series as the start of a series, with One Little Lie the second book?
Hi Kat! Thank you for your question :) I have really enjoyed writing the books so far as stand alones but with continuing characters. Bad Sister introduced psychologist Connie Summers and she is a main character in One Little Lie as well - alongside the police duo DI Lindsay Wade and DS Mack - but book four (out next year) does not follow Connie Summers and is completely stand alone with all new characters. However, I love Connie, Lindsay and Mack and feel sure that they will return!