Poison Wars, book 1: City of Lies
Sam Hawke2018

"I was seven years old the first time my uncle poisoned me..."
Outwardly, Jovan is the lifelong friend of the Chancellor’s charming, irresponsible Heir. Quiet. Forgettable. In secret, he's a master of poisons and chemicals, trained to protect the Chancellor’s family from treachery. When the Chancellor succumbs to an unknown poison and an army lays siege to the city, Jovan and his sister Kalina must protect the Heir and save their city-state.
But treachery lurks in every corner, and the ancient spirits of the land are rising... and angry.

Titre original : Poison Wars, book 1: City of Lies (2018)