Radiance and Revenge (Diamond of the Ton Regency Mystery #3)
Lynn Morrison, Anne Radcliffe

After enduring the court’s suspicion, Lord Peregrine Fitzroy has finally earned back his standing—and Charity’s heart. But the arrival of her family in London threatens to reopen old wounds and reignite a bitter feud that once made their love impossible.
Charity, Duchess Atholl, is ready to stand beside the man who was once her enemy. Yet just as they begin to build a future together, foreign royals descend on London with secrets, schemes—and ties to a powerful adversary thought to be in hiding. Determined to uncover who is harbouring their most dangerous enemy, the couple is drawn into a tangled web of espionage, revenge, and political sabotage..
As whispers swirl of a plot to upend the royal succession, Peregrine and Charity must outwit an opponent who knows exactly how to strike where it hurts most. Loyalties will be tested. One misstep could cost them their love, their lives—or the crown itself.