Hanna Keller and her family run Maggie's Tea House, an establishment heavily influenced by the family's Hungarian descent and specialising in a European-style traditional tea service. But truthfully, one of the shop's largest draws is Hanna's eccentric grandmother, who's known for her remarkable ability to read the future in the leaves at the bottom of their customers' cups. When the shop becomes the centre of a murder investigation after a guest is poisoned, Hanna's determined to find the true killer and exonerate her family.