The East Wind (The Four Winds #4) By Alexandria Warwick

Min of Marles is a skilled apprentice, assisting the town's apothecarist in brewing potions, tonics, and deadly poisons. High in the estate tower where she works, a powerful immortal is kept chained, tortured daily for information. His screams haunt her waking and dreaming hours. A god, she learns. The East Wind, Eurus, who commands the sea-born storms.

A hasty attempt to free him leads to Min’s own capture and forced employment to the East Wind as an aide to his grand plans for revenge. In the City of Gods, a tournament is held every thousand years, in which the winner may ask a favor from the esteemed Council of Gods. If Eurus wins, the council must reverse his banishment, the sentence that exiled him and his brothers to the mortal realms. But he requires a deadly poison to ensure that, once the favor is granted, the council will pay for his centuries long exile.

To earn her freedom, Min reluctantly assists in Eurus’s plans. As they work together to defeat the deadly trials, she realizes her relationship to the East Wind isn’t purely transactional. But if she ever wishes to return home, she must betray the god she loves.

For more stories from the world of the Four Winds, check out The North Wind, The West Wind, and The South Wind.