By a Thread (Elemental Assassin)

Gin Blanco never thought she'd need a vacation from being an assassin. But a few weeks ago, she killed Mab Monroe, her nemesis and the most powerful Fire elemental in Ashland. Now, all the city's lowlifes are trying to make a name for themselves by taking out the Spider. So she heads south to a swanky beach town, along with her baby sister, Bria, for a weekend of fun in the sun. But when an old friend of Bria's is threatened by a powerful vampire with deadly elemental magic, it looks like Gin will have to dig the silverstone knives out of her suitcase after all. But this time, her special powers might not be enough to prevent her from coming home in a pine box...
"Estep has truly hit the jackpot with this outstanding series!" --"Romantic Times," 4 1/2 stars, on "Web of Lies"