You can find softcover editions for approximately €20.95 at Amazon.es or local Spanish bookstores. La puerta del frío (Terror) : Berdejo, Luiso - Amazon.es
Despite the supernatural elements, the characters are described as "human" and "soulful," making the escalating dread feel more grounded. La Puerta Del Frio Luiso Berdejo Arribas epub
The book is widely available in digital and physical formats: You can find softcover editions for approximately €20