Synopsis

Agathe (Marie-Ève Perron) is 44 years old. Separated for seven years from Élizabeth (Amélie Dallaire)—with whom she shares her daughter Charlotte (Agathe Ledoux), a charming 11-going-on-12-year-old—Agathe has noticed her left breast has been severely swollen for a few weeks. Following a painful mammogram, a biopsy confirms the inexorable diagnosis: cancer. The ground gives way beneath her feet, and the abyss grows even deeper when Samuel (Gabriel Lemire), her partner of the last five years, abruptly leaves her.

Thankfully, following the desertion of the love of her life, her circle of friends (Kathleen Fortin, Julie Roussel, Ariane Castellanos, Marie-France Moreau, and Sophie Desmarais) rallies around her. Agathe lets her guard down and allows herself to be carried by their support, though denial is never far behind. From the initial diagnosis to pre-op testing and breaking the news to loved ones, Agathe stumbles through the world of oncology. Hospital appointments stack up, encounters that would have seemed inconceivable months ago become her new routine, and medical jargon starts to make sense. Her nickname, "Miss I-Can-Handle-It," earned through her sheer strength of character, quickly shrinks under the weight of one harsh blow after another. She doesn't have one cancer, but three. She isn't losing one breast, but both. She undergoes heavy-duty chemotherapy and the maximum dosage of radiation therapy. They are trying to save her life.

One might think cancer stripped her of everything: her health, the job she adores, the partner she misses, and her daughter's innocence... yet, the complete opposite will happen. Over the nine months of her treatment, Agathe will learn to set boundaries and truly become an active player in her own recovery.

Le gouffre lumineux is a dizzying dive into the psyche of a patient. It chronicles a medical and deeply personal battle where lucidity and denial, rejection and solidarity, devastating twists of fate and celebratory milestones are masterfully interwoven.