Maureen, a young American living in Paris, works as a personal shopper for a high-profile celebrity. She dislikes her job, finding it unfulfilling and superficial, but continues because it pays the bills. Maureen is also a spiritual medium, yearning to make contact with her recently deceased twin brother, Lewis, with whom she shared a profound bond. Both had made a pact: whoever died first would send the other a sign from the afterlife. Maureen spends her nights in Lewis's old house, hoping for a signal while grappling with her own fears and uncertainties about life and death.

As time passes, Maureen starts receiving mysterious text messages from an unknown sender who seems to know intimate details about her and her brother. The unnerving communication pushes her deeper into a web of uncertainty and tension, causing her to question the nature of the messages and who—or what—might be behind them. Determined to uncover the truth about these enigmatic texts, she embarks on a journey that blurs the lines between the living and the dead, reality and imagination. Maureen's quest for answers propels her into unforeseen circumstances, challenging her perceptions and forcing her to confront the haunting presence that seems to follow her every move.