You might enjoy "Having Tea," by Tricia Foley and Catherine Calvert. Filled with beautiful photos, this book also contains an introduction on "The Pleasures of Tea," as well as various anecdotes about tea interspersed throughout the book.

A great novel that you might enjoy, to do with someone who starts a tea empire, is "The Tea Rose" by Jeniffer Donelly

If you are also a mystery fiction reader then you have to read the charming series by Laura Childs. The 11th title in the series The Teaberry Strangler came out in March 2010. These stories are fun and chock full of tea trivia.

Tea with Jane Austin by Kim Wilson

From Booklist (via amazon):
Among Jane Austen's many attractions for the modern reader are the comfortable domestic details that furnish her novels, and what could be more comforting than tea? Tea was not just a beverage in Austen's time, but a key ingredient in social ritual, and her letters and novels are full of references to its buying, preparing, serving, and drinking. In this book, readers will find not only plenty of tea-related Austen quotes, but a well-researched history of Austen-era tea drinking at different times of day and in different settings. Recipes taken from contemporary cookbooks for old-fashioned delicacies such as orange jelly and syllabub are accompanied by modern adaptations. Austen purists may cringe at the emphasis on cozy charm, but there's definitely something appealing about settling down with a nice cup of Earl Grey, a Bath cake, and a copy of Pride and Prejudice.

The tea shop series by Laura Childs is wonderful, I've enjoyed all the books in the series.