Ruby Fever by Ilona Andrews

#1 bestselling author Ilona Andrews is back with the newest book in the exciting Hidden Legacy series—the thrilling conclusion to her trilogy featuring fierce and beautiful Prime magic user Catalina Baylor.

An escaped spider, the unexpected arrival of an Imperial Russian Prince, the senseless assassination of a powerful figure, a shocking attack on the supposedly invincible Warden of Texas, Catalina’s boss… And it’s only Monday.
Within hours, the fate of Houston—not to mention the House of Baylor—now rests on Catalina, who will have to harness her powers as never before. But even with her fellow Prime and fiancé Alessandro Sagredo by her side, she may not be able to expose who’s responsible before all hell really breaks loose.