Built on the hump to the east of the remains of Grumello Castle, it is wide and very high, with very sober architectural lines.

Externally it is devoid of plaster, except in the apsidal part. The facade ends at the top with a triangular tympanum, is vertically tripartite by pilasters, and is softened by a prothyrum supported externally by slender granite columns. The spacious and harmonious single-nave interior comprises three bays separated by pilasters, ending in elegant stucco capitals. On the vault are three medallions with stucco cornices where episodes from the viat of the saint are depicted. On the wall of the first bay hang two large, very dilapidated canvases of little value. The left chapel is the richest in the church, all adorned with well-made stuccoes, which on the vault and side walls frame frescoes.
The other chapel, simply whitewashed and adorned with a stucco cornice along the entrance arch, like the previous one, has a fine stone balustrade from the 18th century and on the altar a canvas depicting St. Lucy, St. Agatha and St. Apollonia. The high altar is surmounted by a 1600s canvas depicting St. Anthony taken by temptation.

Source: Churches surveyed by the Sondrio Valtellina Mountain Community.