When Typhus' other slaves provoke the Gauls into a fight, the wealthy patrician, Osseus Humerus, is amused and offers to buy them; Asterix mistakes him for Caesar's major-domo and completes the sale.

Goldendelicius expresses dislike of the two Gauls because they come from Typhus (a mark of distinction among slaves) and fears that they might usurp his office.

At daybreak, they return to their cell (to the confusion of the palace guards) and decide to find Caesar and seize the wreath from him.

The next morning, a lawyer comes to defend Asterix and Obelix in a show trial for the "attempt" on Caesar's life.

During the trial, the prosecutor announces the same initial speech intended by the defense lawyer, prompting the latter to call for a suspension in proceedings.

Asterix and Obelix corner Goldendelicius in a tavern and coerce him into exchanging Caesar's laurel wreath for one of parsley.

The album ends with the note that, with Asterix's cure for drunkenness now available to the Romans, they initiate a series of ever-increasing parties that result in the collapse of the empire.