There are 4 books in the Queens Man series. The newest book is Prince of Darkness which came out in 2005.

1
The Queen's Man

Book cover of The Queen's Man
England, 1193: a land rife with rumours about the fate of its missing king. Justin de Quincy travels from Winchester to London. With a promise to a dying man, he is plunged into the conspiracy surrounding the disappearence of Richard the Lionheart, and under oath to reveal the truth to…
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2
Cruel as the Grave

Cruel as the Grave
April, AD 1193: A usurper threatens England's empty throne.

Richard the Lionheart languishes in an Austrian dungeon, prisoner of the Holy Roman Emperor. Eleanor of Aquitaine, his mother, searches for a way to free her eldest son, aware her youngest plots to take the crown. When John seizes Windsor castle,…

3
Dragon's Lair

Book cover of Dragon's Lair
When her beloved son Richard is imprisoned and held for ransom in an Austrian dungeon and the hated Prince John plots with King Phillippe of France to prevent Richard's return, Queen Eleanor sends Justin de Quincy into Wales to recover a ransom payment that has gone missing. 50,000 first printing.

4
Prince of Darkness

Book cover of Prince of Darkness

DECEMBER, AD 1193. England lies uneasy, a land without a king. Richard the Lionheart languishes in an Austrian dungeon and his brother John hungers for the crown. In the Lionheart's stead, Eleanor of Aquitaine rules. She is determined to prevent the outbreak of civil war, but the land is riven…