At a time when the existence of preternaturals is known but not necessarily believed, Camryn Jacobs, direct descendant of witches persecuted at Salem, has a problem. Fireman Declan Walsh, a lycan, is standing on the historic Jacobs House front porch at two in the morning with an infant car seat hanging off his arm. Asleep inside it is a baby witch surrendered in accordance with the Mather, Massachusetts' "baby box" law, which states that infants may be left in a customized vault at the fire station—no questions, no blame, no repercussions—if the parent/s cannot care for it.

Declan asks if Camryn will take the baby to her coven tomorrow to get help figuring out what action to take. Once he pleads his case, Camryn can only agree that this little one can't go to foster parents who aren't preternatural, too. Declan doesn't mention that he's had his eye on Camryn for a while, the reason she popped into his head the moment he saw the magical baby. Impulsively, Declan throws out an offer to stay all night and help with things. Surprising herself as well as him, Camryn agrees.

As the hours pass, they care for Rainy, the temporary name they've given her, and try to figure out what to do. They also learn all about each other. A definite spark is ignited, but there's hundred-year snowstorm raging outside that could smother it, as well as the coven's head witch, Oona, whose shocking personal agenda will threaten not just their budding feelings for each other and the baby, but Camryn 's ancestral home as well.