Perfect — Marne Davis Kellogg

Despite her best intentions, Kick Keswick---international jewel thief, fabulous dresser, gourmet cook, and woman-about-town---finds herself drawn back into the glamorous, dangerous world of jewels (and the people who covet them)....

It should have been the start of a perfect sojourn in Provence. Kick Keswick has just settled down to a warm chocolate souffle with a meltingly delicious Grand Marnier sauce and a small glass of Armanac when she receives startling news: The personal jewels of the Queen of England have gone missing. And she wants Kick to get them back. Most of the world knows Kick as an expert in jewels and antiquities, having been the right hand at Ballantine & Company Auctioneers in London, but others know Kick as the world's finest jewel thief, a woman who can stand out in a crowd at will, but who can also blend in when she wants to.
Kick now desires nothing now more than a quiet life, but Her Majesty requests her expertise (and Kick's vanity is more than tickled). So the chase is on, in a race that takes her from Provence to Paris, London, St. Moritz, and Milan---and puts all her wiles and talents to the test as she faces a thief whose skills match her own. And with Kick Keswick on the case, there will be trouble afoot---of the multifaceted kind....
With sophistication, wit, and insider details, Perfect is a madcap adventure that takes you on a quest for the things that make life worth living...or at least wirth talking about.