Lord of danger - Anne Stuart

Goodreads 3.76

Half-sister to Richard the Fair, Alys has been schooled in the sheltered ways of the convent, far from the treachery and intrigue of castle life. Until she is taken from the cloister and brought to a place filled with secrets. Here she is to meet her future husband, a man some call a monster. His name is Simon of Navarre, a powerful and mysterious lord practiced in the black arts. This sensual stranger both terrifies her and fascinates her...and sets her heart burning with an unfamiliar fire.

Jaded by war, no longer able to believe in human goodness, Simon has turned toward the realm of darkness. But the master magician finds himself bewitched by the innocent Alys, who fears his very touch could damn her forever. Yet even as Simon begins to work his seductive magic, Alys senses the wounded soul beneath the cooly elegant facade. Now, as the two become pawns in Richard's treacherous scheme to become England's king, only one power can save them: the unstoppable force of love.