When witch-apprentice Azami Durand discovers a banned book of dark magic that can kill, mixing salves and potions for old ladies becomes the last thing on her mind. Her coven believes the book will eradicate their members, but how is Azami supposed to resist the low hum of dark magic calling to her?

Azami's crush, Mila Hutchings, is the only person who might know how to manipulate the magic within the book. Mila agrees to help on one condition–clear the Hutching's from the Coven's list of banished families.

As they uncover the truth about the book, a coven witch is found with her throat slit and a bright red kiss on her forehead. Mila and Azami become the number one suspects, but neither knows how to wield the book's power. They must find the real murderer before they become the next victims.