There are 7 books in the Medieval Song Quartet series. The newest book is The Valcourt Heiress which came out in 2010.

1
Warrior's Song

Book cover of Warrior's Song
A medieval melody begins in the prequel to the Song series from #1 New York Times bestselling author Catherine Coulter.

Chandra de Avenellmight look like a golden princess, but she fights like a warrior, dreams a warrior’s dreams, wears a warrior’s pride like a suit of armor. She wants to…
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2
Fire Song

Fire Song
Forced into marriage with Graelam, a daring English knight, beautiful, proud Kassia finds herself caught in a whirlwind of passion and love.

4
Secret Song

Book cover of Secret Song
Winer of the 1989 Romantic Times Award for Best Historical Romance Author, Catherine Coulter's last five books were New York Times bestsellers. Fast-paced, funny, light-hearted, and charmingly romantic, the final novel in the ""Song"" trilogy, Secret Song, will leave readers totally delighted.

5
Rosehaven

Rosehaven
From the #1 NEW YORK TIMES BESTSELLING AUTHOR.

When heiress Hastings Trent is joined with warrior Severin Langthorne in marriage, she must uncover the mystery surrounding a secluded estate known as Rosehaven.

6
The Penwyth Curse

The Penwyth Curse
Sir Bishop of Lythe has come to Penwyth for his royal reward-the keep and young Merryn's hand. But he wonders if a curse will prove his undoing.

7
The Valcourt Heiress

Book cover of The Valcourt Heiress
Set in King Edward's medieval England, this exciting historical romance delivers the trademark wit and vivid characters that fans have come to know and love from #1 New York Times bestselling author Catherine Coulter.