Sylvain, a 72-year-old man, learns that he is going to lose his sight just as his daughter is about to give birth to her first child.

In a sumptuous lakeside hotel, the perfect routine falters when disaster strikes.

Father Cyril Nouvel has mysteriously disappeared. Yet it is at his initiative that his brother, Gendarme Louis Nouvel, and his mentor, Abbé Gomis, find themselves gathered at the site of an abandoned old fort. As they set out to search for him in this vast and oppressive place, tension rises between the two men. Even if they cannot admit it to themselves, each knows deep down that he holds a part of the truth.

Just days before her wedding to Pierre, fearless police captain Anna sees her plans thrown into chaos when a murder is committed within their circle. Caught between a criminal investigation, family secrets, and romantic turmoil, she must solve the case before she can make it down the aisle.