Perumal Murugan 
One Part Woman [EPUB ebook] 

Kali and Ponna s efforts to conceive a child have been in vain. Hounded by the taunts and insinuations of others, all their hopes come to converge on the chariot festival in the temple of Ardhanareeswara, the half-female god. Everything hinges on the one night when rules are relaxed and consensual union between any man and woman is sanctioned. This night could end the couple s suffering and humiliation. But it will also put their marriage to the ultimate test.