Commissioner Dupin's third case. Dusk is just falling on the vast salt gardens of the Guérande peninsula. The air is saturated with the violet scent of fleur de sel, which locals say sometimes induces hallucinations. Commissioner Dupin has a similar feeling when someone suddenly starts shooting at him. At the same time, he just wanted to look at a few mysterious barrels in the salt pans, which were pointed out to him by Lilou Brevalová, a well-known journalist. And then Lilou also disappears without a trace...