There are 2 books in the Beyond Time series. The newest book is Lady Ever After which came out in 2016.

1
Dreamspell

Book cover of Dreamspell
A TIME TO LIVE. A TIME TO DIE. A TIME TO DREAM.

Sleep disorders specialist Kennedy Plain has been diagnosed with a fatal brain tumor. When her research subject dies after trying to convince her he has achieved dream-induced time travel and her study is shelved, she enlists herself as…
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2
Lady Ever After

Book cover of Lady Ever After
THE WARS OF THE ROSES
England, 1464. As civil war rages, King Edward IV besieges the northern barons who support the dethroned King Henry VI. Among the last strongholds to fall is Strivling Castle, whose lady gives her life defending her home against the usurpers.

A LADY OF LEGEND
As…