: The core of the novel is Verónica’s metamorphosis, evolving "blow by blow" into a completely different, battle-hardened person.

: Javier Moreno is widely recognized for his previous works, particularly the Malas Tintas trilogy ( Tinta Negra , Tinta Roja , and Tinta Azul ).

: The fast-paced plot spans multiple Spanish locations, including Madrid, Valladolid, Astorga, and Ponferrada .

The story follows , a young and naive security guard working in the Ventas Metro station in Madrid while she prepares for her National Police entrance exams. Her life takes a dramatic turn when an unknown assailant begins a relentless attempt to kill her for no apparent reason.