The Devilish Lyon by Charlotte Wren

Enter the world of the most notorious gambling den in London, where matches are made… unusually. Welcome to the world of THE LYON’S DEN: The Black Widow of Whitehall Connected World, where the underground of Regency London thrives… and loves.

Mrs. Dove-Lyon, proprietor of the Lyon’s Den, London’s notorious gaming hell, has recently had dealings with three new clients:
Miss Harriet Hurst, who cannot see a thing without her spectacles and who has an unfortunate aversion to strong perfume, is in search of a husband. Her proposal, however, is a little unorthodox.
Ambrose Crossley, fifth Earl of Pendlewood, an upstanding and respected member of the ton, is in search of a wife. His quest, however, is not quite as straightforward as it seems.
Edward Fortescue, Viscount Eskdale, aka the Fallen Angel of Mayfair, has no desire to marry at all. His request is somewhat unusual.
Being a shrewd business woman, Mrs. Dove-Lyon reckons she can satisfy all their needs in one fell swoop. It will require a little bit of subterfuge, a fair amount of manipulation, and a whole heap of good intentions. But, if the gamble pays off, a happy ending for all is assured. The game starts out well, with everything going exactly as planned. But, just as things seem to be reaching a satisfactory conclusion, a tragic secret emerges from the past. The consequences are heartbreaking. The game, it seems, is up.