There are 3 books in the The Lydiard Chronicles series. The newest book is Written in their Stars which came out in 2019.

1
The Lady of the Tower

Book cover of The Lady of the Tower
London, 1609. When Lucy St.John, a beautiful highborn orphan at the court of King James, is seduced by the Earl of Suffolk, she never imagines the powerful enemy she creates in his beloved sister, the Countess of Rochester. Or that her own sister Barbara would betray her and force Lucy…
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2
By Love Divided

Book cover of By Love Divided
”A fantastic read." Editor’s Choice, Historical Novel Society

London, 1630. Widowed and destitute, Lucy St.John is fighting for survival and makes a terrible choice to secure a future for her children. Worse still, her daughter Luce rejects the royal court and a wealthy arranged marriage, and falls in love with…

3
Written in their Stars

Book cover of Written in their Stars
London, 1649. Horrified eyewitnesses to King Charles’s bloody execution, Royalists Nan Wilmot and Frances Apsley plot to return the king’s exiled son to England’s throne, while their radical cousin Luce, the wife of king-killer John Hutchinson, rejoices in the new republic’s triumph. Nan exploits her high-ranking position as Countess of…