War of the Marionettes

Now available in English for the first time, War of the Marionettes is the final novel in Adam-Troy Castro's award-winning Andrea Cort series.
Vlhan. Where a race of incredibly intelligent, and sometimes unpredictably dangerous, aliens yearly perform a dance where tens of thousands of their kind die, all in pursuit of a mysterious purpose vital not only to their own survival but also to that of the human race. But something has gone wrong...
Andrea Cort. Genius. Misanthrope. War Criminal. Solver of Crimes. She has traveled to Vlhan with her lovers, the linked pair known as the Porrinyards. Now, against the backdrop of a sudden and bloody war, she must not only find a missing girl, not only prevent a catastrophe that might spell the end of the human race...but also make a decision that will change her own future beyond imagining.
Previous stories about the Vlhani have been nominated for two Nebulas and one Hugo. The Andrea Cort stories have been also been Nebula-nominated, and the first novel, Emissaries From The Dead, won the Philip K. Dick Award. Now Andrea Cort arrives on Vlhan for the confrontation that will change everything!