Now, after reading everything Bridgerton-related, here's my ranking of the books:
1.° When He Was Wicked
2.° It's In His Kiss
3.° On The Way To The Wedding
4.° An offer from a Gentleman
5.° The Viscount Who Loved Me
6.° Romancing Mr. Bridgerton
7.° The Duke & I
8.° To Sir Philip, With Love