This book is of novella length, and sets the scene for a series called The Portal, featuring three witches from Babylonian times, reincarnated in present day America. It's not book 1 in the series, but book 0.5.
The female lead in this, Amarrah, realised at age 5, when her grandmother started to tell her a 'fairytale', that in a previous life, she had been a maid in the service of the three witches - she informed her grandmother that she knew the story, as she had been there. Years later, with her dying breath, her grandmother revealed their family connection to the witches and entrusted her with a box for safe-keeping, that unfortunately was taken from her, and kept from her for 10 years, until US soldier, Harrison, brought it back from the Gulf War...
There is and isn't too much to this tale - it might sound confusing, but that's true. It's just a vehicle to introduce the tales to follow, but there's a romance for the leads, enough intrigue and history to get the reader into the tale, but it ended too conveniently, too quickly and without a firm HFN/HEA, though the the latter is implied.
It could have been a lot more as a longer novel, and in fact, the leads deserved a tale of their own - both were important characters both in their previous lives, and in this tale, but as I understand, the tales that follow are those of the witches. Hopefully, as the witches' memories return, and as they get reincarnated into modern-day USA, Amarrah and Harrison will feature more in the series as side characters. This was well worth a read.