During the night of August 4-5, 1952, three Englishmen, Jack Drummond, his wife Anne and their daughter Elizabeth were murdered near their car near the farm of the Dominici family, in the commune of Lurs in the Alpes-de-Haute-Provence. Denounced by two of his sons, the patriarch Gaston Dominici was judged and condemned without any real evidence.

A gang of thieves calling themselves the Santa Claus Gang are wreaking havoc, and the police can't keep up. Police Captain Gilbert is distracted by a Chinese reporter writing a story on his squad, and taxi driver Daniel is in the midst of a relationship crisis. After a string of mistakes in which the thieves outsmart the police time and time again, Daniel and his super-taxi pitch in.