Il commissario Maigret: Maigret and the Elusive Witness

SINOSSI

A child while is going to church to make an altar boy sees a corpse in the street. No one else sees that corpse, and two minutes later, that corpse is disappeared. Later the child claims to have invented the story. Maigret must find out, first of all, if the corpse is really existed or if it is a lie of the child.