Four Dead Queens by Astrid Scholte

A divided nation. Four Queens. A ruthless pickpocket. A noble messenger. And the murders that unite them.
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These are the words Keralie Corrington lives by as the preeminent dipper in the Concord, the central area uniting the four quadrants of Quadara. She steals under the guidance of her mentor Mackiel, who runs a black market selling their bounty to buyers desperate for what they can’t get in their own quarter. For in the nation of Quadara, each quarter is strictly divided from the other. Four queens rule together, one from each region:

Toria: the intellectual quarter that values education and ambition
Ludia: the pleasure quarter that values celebration, passion, and entertainment
Archia: the agricultural quarter that values simplicity and nature
Eonia: the futurist quarter that values technology, stoicism and harmonious community

When Keralie intercepts a comm disk coming from the House of Concord, what seems like a standard job goes horribly wrong. Upon watching the comm disks, Keralie sees all four queens murdered in four brutal ways. Hoping that discovering the intended recipient will reveal the culprit – information that is bound to be valuable bartering material with the palace – Keralie teams up with Varin Bollt, the Eonist messenger she stole from, to complete Varin’s original job and see where it takes them.