The Girl in the Tower - (Winternight Trilogy) by Katherine Arden

The Bear and the Nightingale continues Vasilisa's magical adventure as a young woman, defending Moscow against siege.

With her unique gift for seeing what others can't, she must choose between marriage or life in a convent.

Driven from home by frightened villagers, Vasilisa chooses adventure and dresses herself as a boy, setting off astride her magnificent stallion Solovey.

After prevailing in a skirmish with bandits, she is anointed a hero by the Grand Prince of Moscow and reunited with her beloved sister and brother.

But can she keep her true identity hidden from the court?