Encore in Death (In Death 56) by J.D.Robb

The Sunday Times bestselling series is back. Eve Dallas is investigating the murder of a much-loved actor at a glittering party. The spotlight has never been brighter. Or deadlier...
It was a glittering event full of A-listers, hosted by Eliza Lane and Brant Fitzhugh, the most glittering of all celebrity couples. Everyone had expected the party to be in the newspapers the next day but not because one of the hosts was murdered! As the crowd had gathered to watch Eliza sing, Fitzhugh had raised a final toast to his glamorous wife and fallen to the floor. Death by cyanide poisoning. It's time for Lt. Eve Dallas to make her entrance.
From all accounts, Fitzhugh wasn't the kind of star who made enemies. Eliza, on the other hand, had many rivals, and a few of them could class as enemies. Since the champagne cocktail that killed Brant was originally intended for Eliza, could it be that she was the real target?
With so many people at the party, Eve has her work cut out determining who could commit murder in the middle of a crowd. As one who's not fond of the spotlight, she dreads the media circus surrounding a case like this. All she wants is to figure out who's truly innocent, and who's only acting that way...