‘Bridgerton’ season 3 is based on ‘Romancing Mister Bridgerton,’ the fourth book in the series by Julia Quinn Warning: Season 3 Bridgerton spoilers ahead! Bridgerton has stuck to the book order of the original series of the same name — until now. Season 3 of the popular Netflix show follows the romance between Penelope Featherington (Nicola Coughlan) and Colin Bridgerton …