Murder in a cup / Lauren Elliott.

Enhanced descriptions from Syndetics:

As the descendant of an Irish witch and the owner of a New Age tea shop, intuitive gemologist Shay Myers has been living her most authentic life since moving home to California's scenic Monterey Peninsula. But in the latest Crystals & CuriousiTEAS Mystery from USA Today bestselling author Lauren Elliott, not even her heightened senses can predict how to run a business-or catch a killer...

Self-taught "seer" Shay has much to learn as autumn hits the quaint coastal town of Bray Harbor. Since attempting the art of blending herbs at her popular shop, Crystals & CuriosiTeas, she's set on growing ingredients in the mysterious greenhouse on the second floor-if only she can separate the medicinal plants from the deadly ones. Her new skills are put to the test when she meets pub owner and ex-detective Liam Madigan's Gran. A psychic from Ireland known for interpreting tea leaves and people, Gran encourages Shay to build upon her natural talents and hold her own group reading . . .

Despite Shay's reservations about putting herself in the spotlight, the evening goes off without a hitch. At least, until she does a reading and a customer goes from chatty to dead in a flash, poisoned after sipping a toxic substance recently grown in the greenhouse. Worse, Shay's assistant is suspected of intentionally serving the lethal brew and committing cold-blooded murder. Now, aided only by Liam and her dog Spirit, Shay must exonerate her employee and save the future of Crystals & CuriosiTeas. But when clues start lining up like leaves in a teacup, she'll need to understand the signs right in front of her to catch the manipulative murderer before it's too late . . .

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Kirkus Book Review

Shop owner Shayleigh Myers continues to defend her legacy against threats worldly and otherworldly. Shay never knew her mother, Bridget Early, but she received two precious gifts from her: Crystals & CuriosiTEAS, a tea shop in Bray Harbor, California, and an amulet containing a mysterious blue stone. The first she runs as a means of making a living and sharing her mother's herbal healing secrets with her neighbors. The second she wears on a cord around her neck, showing it only to a select number of family members and friends. Now Peter Graham is threatening to ruin Shay's business with a lawsuit accusing her of indoctrinating his teenage daughter, Tassi, into the practice of witchcraft through Tassi's part-time job at CuriosiTEAS. In the meantime, Shay's neighbor Liam Madigan alerts her to the possibility of a messenger sent from the old country who has his eye on her amulet. Liam's Gran, recently relocated to Bray Harbor from Ireland, has a wealth of information about Shay's lineage, though she parcels it out sparingly for fear of overwhelming Shay with too-powerful knowledge of her ancestors' association with seers and fairies. While Shay is intrigued by Gran's folk wisdom, she has a more pedestrian task ahead of her: finding out who poisoned Peter's girlfriend, Jasmine Massey, before the police charge Tassi with the crime. For readers who like their whodunits with a supernatural twist. Copyright (c) Kirkus Reviews, used with permission.