Fireflies by Shea Hulse

Bridget had never considered herself special, odd definitely. But nothing worth looking at twice. And she had never cared to be looked at twice either. Until Declan, that is. Then one night Bridget is approached by a strange (and large) dog. Rescued by Declan, he reveals that Bridget may be special after all, a goddess even. And the dog has been sent to protect her. Does she have the strength to defeat a powerful witch and her three sons? Why is Declan involved in magic and mystery anyway? And can she save Ruad, her handsome mentor and the God of Knowledge into this new world? As they dig deeper, they uncover that they all have more in common than just their troubled pasts.