Even naturopathic doctors need a little stress relief - that's why Willow McQuade, ND, takes a break to visit her Aunt Claire, owner of Nature's Way Market and Cafe, on Long Island's North Fork. But Willow's serenity is shattered when she finds her aunt's lifeless body on the market floor, a bottle of Mimulus lying nearby. Taken to calm one's fear of misfortune, the flower essence clearly failed Aunt Claire... for her death was no accident.

But who would want to kill her? The police soon zero in on Willow herself, who stands to inherit Claire's business and the rights to a breakthrough anti-aging cream. Desperate to prove her innocence, Willow turns to former police officer Jackson Spade for help. Together they unearth a slew of suspects, each with something to gain by Claire's unnatural demise. But as Willow gets closer to the truth, a killer waits to administer one final dose of death.