book cover of Tranquil Toxins
 

Tranquil Toxins

(2026)
(The fourth book in the Downward Dog Mystery series)
A novel by

 
 
Yoga instructor Phoebe Winters thought leading meditation sessions at the luxurious Serenity Springs Retreat was the perfect blend of peaceful practice and mountain serenity. But when a famous wellness influencer collapses during a candlelit sound-bath and dies from poison, Phoebe's tranquil sanctuary becomes ground zero for murder. With her reputation in tatters, threatening notes appearing in her meditation room, and the retreat's financial survival hanging in the balance, Phoebe must stretch far beyond her comfort zone to uncover who brought toxic secrets to her peaceful mountain refuge before the killer strikes again.

Armed with her intuitive standard poodle Sterling and her fiercely loyal best friend Maddie, Phoebe discovers that the victim's picture-perfect wellness empire was built on a foundation of stolen businesses, ruthless betrayals, and devastating blackmail schemes. From bitter ex-business partners seeking revenge to humiliated assistants with access to the victim's room, everyone at the luxury retreat seems to harbor secrets worth killing for. As Sterling's remarkable instincts lead them to hidden evidence and the threats against Phoebe escalate from warnings to direct danger, she realizes the murderer is desperate to keep the truth buried. With Detective Sawyer's investigation closing in and time running out before more lives are destroyed, Phoebe must find her center and unmask a killer who's proven that even the most serene settings can hide the darkest intentions.

In this fourth installment of The Downward Dog Mysteries, Phoebe Winters learns that true serenity comes not from perfect circumstances but from maintaining your balance when everything threatens to throw you off center. With Sterling's elegant presence providing both comfort and surprising investigative skills, and Maddie refusing to let her face danger alone, Phoebe must navigate a web of betrayal, jealousy, and long-simmering revenge to restore peace to the retreat she loves. Perfect for fans of cozy mysteries who enjoy luxurious settings, clever heroines, and four-legged companions with uncanny instincts, Tranquil Toxins proves that sometimes finding justice means standing firm even when serenity shatters around you.


Genre: Cozy Mystery

Used availability for Hailey Hartley's Tranquil Toxins


About Fantastic Fiction       Information for Authors