Georgette Heyer was in her early twenties when Simon the Coldheart was published. She was a severe critic of her own work and this title was one of about five or six that she said she didn’t want to be republished. After Heyer’s death in 1974, her son decided that his mother had judged her work too harshly and the book was reprinted in 1977.
Simon Beauvallet is the fourteen-year-old illegitimate son of Geoffrey of Malvallet. His mother died when he was about ten and his father had never bothered with him.
As the book begins, Simon presents himself at Fulk of Montlice’s castle, his father’s enemy, with the desire to become his page. Alan of Montlice, Fulk’s son, was a little younger than Simon. He happens to meet Simon as he is intercepted by a guard when trying to enter the castle. Taking an instant liking to him, he leads Simon in to meet his father. Fulk is impressed by Simon’s attitude and makes him page to Alan. Fulk later made Simon his own page and swore that there was more of himself in Simon than in his own son.
Simon grew to manhood. He became firm friends with Alan and Simon’s older half-brother, Geoffrey, but there was always an icy reserve in his manner with everyone. His prowess in battle earns him knighthood and lands. He fights under Prince Henry, the future Henry V. By the time of the Battle of Agincourt, Simon has turned thirty and,
‘He had power and wealth, a splendid body, fit for any hardship or endurance, a not unpleasing countenance, and a quick, cool brain. Yet something he seemed to lack, for with all his assets and attainments, he was as cold as stone, almost as though some humanizing part of him had been left out in his fashioning. There were those who said that a softer side of live and passion was not in him, but Henry the King, wiser than these, would point to some frolicking page in the Beauvallet green and russet when he heard this criticism.
‘What! Do ye think Beauvallet hath no tenderness within him? Fool, what of the children.?’
The critics were silenced then, for Simon’s love of children was well-known.’
Henry and Alan believed that there was something in Simon that would spring to life one day, but Geoffrey’s response was,
‘What manner of woman will it be before whom Simon will fall? How many fair maids hath he passed by? And now he is past thirty. He is not like to love. It is too late.’
Heyer’s last book written before she died was My Lord John which overlaps slightly with this book. Her first love was for the Middle Ages, although she is best known for her Regency romances. Simon the Coldheart reminded me of the type of historical fiction my sons really enjoyed in their early teens and although they didn’t get to read any of Heyer’s novels, I’m sure they would have taken to her writing. She is very good at portraying family life and in this book, male friendship.
Lots of ye, thou, hast and battle exploits, chivalry and derring-do. 
Although Simon had a cold manner, he was loyal. His relationship with Fulk of Montlice and that man’s acceptance of him became almost that of father and son and Alan and Geoffrey were true and devoted friends. As you’d expect, something in Simon did spring to life in time but I won’t go into that. 
Recommended for those who enjoy the historical time period of the Middle Ages. There are romantic elements but not enough to turn off younger readers who prefer action. It has a slightly G. A. Henty feel about it with the added benefit of humour.