A married couple loses their children while on a family trip near some caves in Tijuana. The kids eventually reappear without explanation, but it becomes clear that they are not who they used to be, that something terrifying has changed them.

Lidia is a responsible and dedicated maid for a hugely wealthy, elderly Tijuana matron who loves only her pet whippet. Rafael is a quiet and dignified janitor who buys a new pair of shoes to celebrate his imminent retirement from the large corporate facility where he's worked for 30 years. When Lidia's boss dies, leaving everything to her dog, and Rafael's plans get derailed, they both turn to criminal subterfuge to get what their harsh lot in life has denied them.

In this sequel, the story intertwines the perilous business dealings of Ultranet's executives with the Chinese mafia, and Dante's journey back to his hometown upon learning of his soon death. There, he meets Ariadna, Ultranet's president's daughter, who is unknowingly in danger. As their paths cross, Dante uncovers the peril surrounding her, blending his search for meaning with her need for protection.

Dianne travels alone to Mexico in search of her missing sister. Her investigation presents unsettling encounters leading her on a mind-bender as she attempts to unravel the truth.