While this series has a delightful and intriguing premise, that of the interactions of a group of magic wielding immortals with the mortal realm they inhabit, the execution leaves a lot to be desired. This, the first novel in a 4 book series, is by far the best, introducing characters, and setting the stage for the conflicts, both political and personal, to come. It's reasonably well written, nicely paced, and full of interesting characters. It makes you want to buy the next book.
Don't.
In fact, don't buy this one.
The series goes downhill fast. Characters become wooden, the same scenes are replayed time and time again. Do we really need a recap of the previous chapter at the beginning of the next one? By the time the third book rolls around, plot devices are becoming fantastical to the point of absurdity, and obvious solutions are ignored.
The last novel is abysmal. Fallon's prose has become hackneyed, characters repeat the same lines at infinitum, plot devices and "coincidences" become fully unbelievable, and the resolution is a let down of epic proportions.
So while you may enjoy the first book, you might allow yourself to get hooked, resulting in a waste of forty dollars, or however much you spend on all four books.
So do yourself a favour, and skip this series. Her other books are much better, and there are many other authors out there that you will enjoy more.