Upon the death of Clara Villalobos (a fashion designer), two former friends, Andrea Onieva and Patricia Villalobos (Clara's sister), meet again after 18 years.[1] They try to shed light on the mystery of Clara's death,[1][2] finding out on the fly that Clara actually had a double life and had been a victim of rape.[3]
Círculo rojo was produced by Ida y Vuelta (a subsidiary of Boomerang TV).[2][4][5] It consisted of 16 episodes,[6] which were directed by Juanma R. Pachón, Carlos Navarro and Iñaki Peñafiel.[7] Goyo Quintana was credited as executive producer.[7] Shooting began on 21 August 2006.[8]
It premiered on 7 May 2007, earning a weak 2,2 million viewers and 12.7% audience share.[9] Moved to the late night slot, the finale aired on 23 July 2007, earning 1,022,000 viewers and a 19.5% audience share.[10] It was the first series to stream on the Antena 3's VOD service.[11]