The silence of mothers

The darkest case of her career awaits Commissioner Elena Blanco and her team. The corpse of a young man with a large scar on his abdomen is found in a van in the parking lot of the city's towing service. He has a nearly seven-month-old fetus sewn into his body, and DNA analysis confirms that it is his biological child. A few days later, another body of a man murdered in the same way is discovered in the port of A Coruna. What connects the two cases and where are the mothers of these children?