This dual timeline story is set in 1907 London and AD 60 Britannia. The theme of the book deals with rights for women with the emphasis on suffrage. While I am a fan of dual timeline stories, over 1800 years was a bit too great a gap for me. I was almost half-way through the book before I gleaned the significance of the connection between the two storylines. Honestly, after around one-third of the way through I had begun just skimming the chapters set in AD 60 as I had not developed an interest in that part of the book, and that didn't change even after I understood its role in the book as a whole. The 1907 storyline was quite interesting with a married couple serving as investigators in the murders of two debutantes, reminiscent of Pepper Basham's Freddie and Grace mystery series. I am sure I would have given The Sisterhood a higher rating if I had only based it on this storyline.
I am grateful to have received a complimentary copy of The Sisterhood from St. Martin's Press via NetGalley without obligation. All opinions expressed here are my own.