Queen's gambit / Elizabeth Fremantle.

Enhanced descriptions from Syndetics:

This brilliant historical fiction debut takes you into the heart of the Tudor court and the life and loves of the clever, charismatic Katherine Parr, Henry VIII's sixth and last wife.

Widowed for the second time at age thirty-one Katherine Parr falls deeply for the dashing courtier Thomas Seymour and hopes at last to marry for love. However, obliged to return to court, she attracts the attentions of the ailing, egotistical, and dangerously powerful Henry VIII, who dispatches his love rival, Seymour, to the Continent. No one is in a position to refuse a royal proposal so, haunted by the fates of his previous wives--two executions, two annulments, one death in childbirth--Katherine must wed Henry and become his sixth queen.

Katherine has to employ all her instincts to navigate the treachery of the court, drawing a tight circle of women around her, including her stepdaughter, Meg, traumatized by events from their past that are shrouded in secrecy, and their loyal servant Dot, who knows and sees more than she understands. With the Catholic faction on the rise once more, reformers being burned for heresy, and those close to the king vying for position, Katherine's survival seems unlikely. Yet as she treads the razor's edge of court intrigue, she never quite gives up on love.