The ritual consist in lowering a shrine containing a rib of Jesus Christ (called "the Sacred Rib") which is kissed by the devotees and carried around the streets as far as the Santuario della Santissima Pietà.
According to the legend, in Cannobio on 8, 9, 10, and 28 January 1522 in Tommaso Zaccheo's inn occurred miracles.
A waitress, gone upstairs to take clean sheets, noticed that the little painting of the Man of Sorrows, representing Jesus between the Virgin Mary and Saint John, was bleeding.
The inn was than demolished in order to allow the building of the majestic sanctuary, whose constriction was supported by Charles Borromeo, that today still preserve the painting and the bloodstained sheets.
After the procession the devotees traditionally eat pasta e fagioli and luganega, a beef sausage with garlic prepared with potatoes and sauerkraut.