Lee Cronin's The Mummy

In Aswan, Egypt, a man, a woman, their two sons, and their daughter, Layla, arrive home to find their pet bird dead. The parents go to the cellar, which is revealed to be built on a buried black pyramid. Inside, a black basalt sarcophagus contains mummified human remains that begin moving, and the father is killed by a supernatural force.

In Cairo, investigative TV reporter Charlie Cannon lives with his pregnant wife, Larissa, and their children Katie and Sebastián. Katie is friends with Layla. One morning, Katie is visited by the woman from Aswan, known as the Magician. She identifies herself as Layla's mother and uses candy to lure Katie away before kidnapping her. Charlie gives chase but loses them in a sandstorm. He and Larissa report the kidnapping to the authorities, working with an English-speaking junior detective, Dalia Zaki, while the lead detective suspects the parents.

Eight years later, in Albuquerque, New Mexico, Charlie, Larissa, Sebastián, and their third child, Maud, now live in the home of Larissa's Catholic mother, Carmen. In Aswan, a teenager witnesses a cargo plane carrying the sarcophagus crash. Inside, archaeologists find Katie wrapped in parchment inscribed with an ancient language. Katie, who is in a catatonic state and habitually self-harms, is moved back home with Charlie and Larissa.

The family refuses to seek further medical help despite Katie's erratic behavior, in which she frequently escapes her room and mutilates herself. After noticing the inscriptions on Katie's skin, Charlie consults an archaeology professor, who translates the writings. The inscriptions are about Nasmaranian, an ancient demon who destroys families and communities, but is kept at bay through ritual mummification that embeds the scripture into skin. As the scripture is removed, Nasmaranian becomes more powerful.

Charlie realizes that Katie is communicating via Morse code, which she had learned in the Girl Scouts before her abduction. He translates her message and realizes that she is saying Layla's name. He searches a collection of support letters received after Katie's kidnapping and finds an unopened letter from Layla, featuring a picture of the candy used to lure Katie. He relays the name to Dalia, who traces the letter to the house in Aswan. Dalia investigates the property and discovers the pyramid. The Magician ambushes her, but Dalia shoots her. Layla arrives home and gives Dalia a VHS tape labelled 'Katie'. Meanwhile, Katie sheds more of her bindings, takes control of her siblings' minds, and kills Carmen. At Carmen's funeral, Katie and Maud terrorize the guests and desecrate their grandmother's corpse.

Dalia travels to Albuquerque with the tape, which reveals the ritual that transferred the demon into Katie by the Magician. The latter is revealed as a member of an ancient cult that keeps Nasmaranian buried by offering it live hosts. While Charlie and Larissa watch the tape, Katie hypnotizes Sebastián into helping remove more scripture from her body. She attacks her parents and Dalia, beating Charlie and forcing a scorpion into Dalia's throat. Having memorized the demonic transfer chant from the tape, Dalia transfers Nasmaranian from Katie into Charlie, who willingly sacrifices himself. Bound inside a coffin in the basement, Charlie manages to tap "I love you" in Morse code. Katie, now free of demonic possession, begins to recover and build a proper relationship with her siblings.

Some time later, Larissa calls Dalia about Charlie. Back in Cairo, the Magician, having survived, is incarcerated. Larissa and Dalia arrive at her cell, sedate her, and reveal the possessed Charlie. Dalia starts the chant of the ritual that will free Charlie from possession while sacrificing the Magician.