When the monsoon-darkened sky finally brightens up to illumine its daytime greenery, Kerala senses Onam in the air. There is moisture left from three months of June-August rain, but the tropical stretch bears freshness in its warmth. This turn of season typically adds to the beauty of the sight, sound and smell across the swathe between the Arabian Sea and the Western Ghats—as is evident from the opening a period novel released recently.