Killing Time by Christine Pope

When time itself becomes your enemy, who can you trust?

Stranded in 1947, witches Devynn Rowe and Seth McAllister find themselves caught in a deadly game of cat and mouse. With Seth’s cousin Ruby kidnapped by a dangerous Wilcox primus who believes he can break an ancient family curse, they’re in a race against time itself.
Devynn’s time-traveling abilities are growing more unstable by the day, threatening to trap them in the past forever. Meanwhile, Seth must put aside generations of distrust to work with the very family his clan has always viewed as their mortal enemies. As the couple delves deeper into the Wilcox family’s dark secrets, they uncover a plot far more sinister than they could have ever imagined.
When Devynn falls into the hands of a man willing to sacrifice everything — and everyone — to achieve his goals, Seth must choose between his family’s ancient prejudices and saving the woman he loves. With the dark of the moon approaching and a deadly ritual looming, their only hope lies in the very magic that has kept their families apart for generations.