Seven Secret Spellcasters by Lynn Cahoon

Everyone’s favorite kitchen witch is back in this new cozy mystery from New York Times bestselling author Lynn Cahoon. As Mia prepares for her transfer of powers on Halloween Eve, a murder implicates her boyfriend and his familiar . . .
Besides her witch’s training, Mia has a lot on her plate with her catering business and cooking school in the Idaho town of Magic Springs. As All Hallows Eve approaches, Mia has almost completed her apprenticeship with Grans and must decide if she will join the coven. At the same time, her boyfriend Trent’s familiar, Cerby—an adorable Maltese whose powers are far greater than his six-pound fluffy body might suggest—has flunked out of hellhound training at the werewolf camp. Something about a dragon?
What’s more, the National Office of Magical Creatures has sent an investigator to check out suspicions regarding Trent and Cerby. But when the investigator is found floating dead in the river behind Trent’s cabin with Cerby’s paw prints nearby, Mia’s boyfriend and his furry friend become murder suspects. Now she’ll have to use her own powers of investigation to save them both . . .