On Tuesday, in broad daylight, Evelina Potapova was detained with a weapon in her hands near the cold corpse of her lover's wife. The girl is horrified and insists that she did not kill. But who will believe her? Even the lover is sure that the murder of his wife is the work of Evelina, who wanted to marry him, no matter what. The testimony of witnesses, fingerprints, everything speaks not in favor of the accused. There remains only one hope for the investigation of the detective agency "Miroslava", where and her aunt’s friend Andriana Karlsonovna Koval asks for help in the investigation.