As with previous installments The Invisible Guardian (2017) and The Legacy of the Bones (2019), the film was set to premiere theatrically in Spain (on March 27th 2020), followed by a streaming release in other countries through Netflix. However, due to the COVID-19 pandemic, it premiered on Netflix worldwide, including Spain.
Benn Northover, who plays Amaia's American boyfriend, James, is actually from Suffolk, England. This explains his distracting delivery, peculiar word choice and unusual cadence.