L'assassin est à l'écoute (1948)

First of April : April fools galore in the studios where a radio broadcast takes place ;the MC pretends to shoot dead all the artists .Eventually ,up comes the "letters to the editor " man :this time , the poor guy is shot dead for good.The radio host is abducted ,and while he is in captivity ,he still believes he is the victim of a long "April fool"!Meanwhile , as the captain is an incompetent,three of the artists decide to investigate :Louise shows flair and insight.