Deadly Inheritance by Simon Beaufort

 Murder, intrigue and marriage in the Welsh Marches of old . . . - When Sir Geoffrey's unpopular brother, Henry, is murdered, he unwillingly inherits Goodrich Castle in the Welsh Marches. Immediately, his sister pushes him towards a marriage that will provide an heir and stability for the family. But when Geoffrey survives attempts on his own life, he wonders whether they are linked to Henry's death, to his potential brides, or even to the rumoured murder of the Duchess of Normandy, as a Welsh revolt against the English looms.