Paz Castelló has a law degree from the University of Alicante. Throughout her extensive professional career, she has combined journalism—she has worked for various media outlets and institutions—and law, alongside a prolific literary career. Nina Sweet is the pen name she uses for her romantic suspense novels and with which he has had an acclaimed trajectory.

She lives with her partner on the shores of the Mediterranean Sea, at their country house in a small town in Alicante, surrounded by nature and her cats. She enjoys writing by a fireplace, with jazz music in the background and a glass of wine.