Olga accepts an invitation from her new acquaintance Yevgeny to attend courses run by his sister Nastya, who teaches business basics to mothers.
But at the door, they run into investigator Kartashova, who brings terrible news: Anastasia has been murdered. Soon, Yevgeny begins receiving notes supposedly from the deceased woman. Noticing numbers in them, Olya quickly identifies the origami folding sequence developed by Japanese mathematician Fumiaki Fujita. Following the instructions, Olga and Svetlana make figures that unexpectedly give them a lead in the murder investigation. But what if the mysterious sender is only trying to confuse the detectives?
To find out what happens next, watch the detective story «Fujita’s Riddle» online on ivi.
