The Conspiring Woman - Victorian Bookshop Mysteries, #4

From the author of The Counterfeit Lady and The Royal Assassin comes an all-new Victorian Bookshop Mystery featuring antiquarian bookseller Georgia Fenchurch, who doubles as a private investigator for the secret Archivist Society... When Georgia Fenchurch is called in to find Sir Edward Hale's missing son, she's soon embroiled in multiple mysteries. After discovering young Teddy's been taken by his mother, her worry lessens.
But further investigation reveals other well-to-do women have disappeared. Have they been kidnapped? Killed? Or is there something even more sinister going on... To muddle the mix further, the Duke of Blackford has asked to speak with Georgia when he returns to England. It's almost enough to distract any woman. Once Lady Hale is found dead, Georgia knows the Archivist Society must focus their efforts on finding the truth behind her disappearance and rescuing her son.
But then a villain from Georgia's own past resurfaces...