This is a love story set in 1357, about a decade after the onset of the Black Death and during the early stages of the hundred years war between England and France.
Sir Garren owed everything to his feudal lord, William Earl of Readington, who had adopted him as his squire when Garren was a penniless boy. Garren had fought at Lord Readington's side until the earl was badly wounded in a great battle (not specifically named but it would almost certainly have been Poitiers). Garren rescued his liege and brought him home, but the earl has never recovered his health, and at the start of the book is close to death.
William asks Garren to undertake a pilgrimage on his behalf, to pray for him at the shrine of Saint Larina. Garren's faith has been badly undermined by the horrors of plague and war, and by the corruption of the church, but for his friend and liege lord
he agrees.
Another traveller in the same group of pilgrims has very different motives. Dominica is a sixteen year old maiden, an innocent and very pious girl who had been taken in by the nuns of the local priory when she had been left on their doorstep as a baby. She wants to complete the pilgrimage and then take her vows as a novice. Dominica is intelligent but very naive - and of course, this being a Mills and Boon romance, she has a very attractive figure, hair like poured honey, and eyes of the purest blue which Sir Garren has ever seen.
Richard, Lord Readington, younger brother and heir of the Earl, wants to get rid of his elder brother's devoted knight. And the snobbish and worldly Prioress does not want Dominica to join the order, partly because of her presumed illegitimate birth but mostly because Dominica wants to translate the bible into plain Enlgish, which the Prioress regards as heresy. (Controversy over whether the bible should be made available in language which the majority of people could understand was a real historical feature of the time this novel is set.)
So Richard and the Prioress hatch a vile plot: He gives the Prioress money with which to offer the penniless but very handsome knight a bribe to seduce the innocent virgin. If he does, Richard can then feign moral outrage and turn Garren away for ruining the girl, while the Prioress can refuse to accept Dominica as a novice beause of her unchastity.
Garren is shocked by what the Prioress asks him to do, but he desperately needs money - and as the pilgrimage continues he finds her innocent charms harder and harder to resist. Meanwhile Dominica, who harbours the foolish idea that Garren is some kind of saint, does not realise her danger. Yet she is oddly drawn to him in a way she cannot understand ...
Not the most plausible historical romance that I have read, though the author has gone to some trouble to get the major events and themes of fourteenth century history right. But not a bad read either.