Previously in Valentin & The Widow:

It is 1924. The widow Eleanora Rosewood and her valet Sacha Valentin are on the trail of Dominion, a villainous cabal that seeks to control the world. Lady Rosewood hopes to undo the work of her late husband Edgar, who was one of Dominion's secret leaders. Together, she and Valentin thwarted a scheme to destroy Shanghai with an earthquake machine, and exposed a finishing school in Havana that turned young women into hypnotised assassins. Now they have travelled on to a new city to face new dangers...