The White Spider of Savignac

When Sir John FitzAlan, lord of an elite mercenary company, is rewarded with the Aquitainian barony of Savignac by Richard Lionheart, his future seems straightforward enough: restore a neglected estate to readiness for war and make the best he can of an arranged marriage to its baroness, Mellisane, a woman he has never met.
Twice-widowed Mellisande, however, is in no mood for a third marriage. Far from the demure chatelaine John expects, she is an expert vintner and herbalist - skills her people, and her bishop, suspect she used to murder her two previous husbands.
As John's disciplined soldiers clash with the unruly local people, and relations with his wife grow colder, John begins to wonder if the tales told of her are true. Will he be Mellisande's next victim?