Le cas Lagaffe, written and drawn by Franquin, is the ninth album of the original Gaston Lagaffe series.

It is composed of 52 strips previously published in Spirou.

Two new Gaston's pets appear: the cat, the laughing gull,[1] plus already presented the mouse Cheese and the fish Bubulle.

These new pets cause most of the gags of the album.

The number of pages is 54, whereas previous albums consisted of 59.