Exceptional for her practicality and plain looks in a family of flamboyant dreamers and artists, Alyzon is at first overwhelmed and alarmed but then entranced by the power of her newly heightened senses, brought on by a concussion. Most remarkable is Alyzon’s sensitivity to smell: People smell not of perfume, sweat or fabric softener, but of something more essential. Caramelized sugar and coffee grounds waft from her loving father, while alpha–cute boy Harlen, who should smell scrumptious, reeks of rotting filth. Could someone’s essential smells indicate the state of his soul? With support from her ocean breeze–scented friend Gilly’s talented Scooby Gang of pals, Alyzon struggles to solve the increasingly complex mystery of metaphysical aromas, which threatens not only her family but the entire world. The premise is interesting, but the pace ponderous, as Alyzon inches ever so slowly toward understanding and using her power to protect her loved ones. Carmody’s detailed exposition, bold theorizing and somewhat saggy plotting will leave readers who persevere disappointed to learn that Alyzon’s adventures end with this stand-alone. (Paranormal mystery. 12 & up)