The visually impaired police detective Blanca and her colleagues, inspector Martusciello, special agent Carità, Liguori and Micheli, find themselves trying to crack two apparently unrelated cases: the trafficking of illegal animal species from abroad and the death of a woman who died from the bite of a very rare and deadly spider. The first case will lead to the deaths of two veterinarians, while the second seems to be the work of a serial killer whose weapon of choice is spiders. The investigations get bogged down and it’s chaos at the police station, as all the players know just part of the picture and are not eager to share their part with the others.