Four detectives and the case of mystery hotel

When the jewels and other valuables of the customers started to disappear, private investigators "Four detectives" enthusiastically threw themselves to the case. It took only two days from them to find out who were the robbers, but that information was unfortunately never told to anyone. Four detectives disappeared completely, only to be found a week later in an abandoned warehouse, all naked and locked in cages. The case was published around in many newspapers, and although there was much speculation, they never told anyone what had happened to them.