Murder in a Teacup — Vicki Delany

In national bestselling author Vicki Delany's delightful Tea by the Sea mystery series, Lily Roberts -- Cape Cod tearoom proprietress and part-time sleuth -- stirs up trouble when she unwittingly serves one of her grandmother's B&B guests a deadly cup of tea . . .
 
Lily has her work cut out for her when a visit from her grandmother Rose's dear friend, Sandra McHenry, turns into an unexpected -- and unpleasant -- McHenry family reunion. The squabbling boils over and soon Tea by the Sea's serene afternoon service resembles the proverbial tempest in a teapot. Somehow, Lily and her tearoom survive the storm, and Sandra's bickering brethren finally retreat to Rose's B & B. But later that evening, a member of their party -- harmless Ed French -- dies from an apparent poisoning and suddenly Tea by the Sea is both scene and suspect in a murder investigation!
 
Mercifully, none of the other guests fall ill. They all ate the same food, but Ed insisted on bringing his own special blend of herbal teas. So it seems, amid the whining and dining, someone snuck up to one of Lily's cherished teapots and fatally spiked Ed's bespoke brew, but who? Was it Ed's long-estranged sister-in-law? Did teenage troublemaker Tyler take a prank too far? Or perhaps the family's feuds have been steeping for longer than anyone realizes? It's up to Lily, Rose, and their friends to get to the bottom of the poisoned pot and bag the real culprit behind the kettle murder plot.