An Unwilling Bride by Jo Beverley

The Duchess of Belcraven committed a folly, and bore her husband another man’s child. But Lucien was a third son, so all was patched over.

Then the two older boys drowned, leaving disaster.

Now, over twenty years later, the duke learns he has a legitimate daughter—Beth Armitage, a child of his blood—and he compels Lucien and Beth to marry.

Lucien, now the arrogant ducal heir, is devastated to learn he is not his father’s child and that the only way to his fortune is through his unwilling bride: an independent schoolteacher raised in the principles of the Rights of Women.

Can there be any common ground?