about 3 A.M.
Marta joined in eagerly . `` That might cure you of your silly imaginings , Minna . She actually thinks , Colonel Bouchard , that she hears them groan and moan and even shriek . Did n't you say they shrieked as well as groaned and moaned once about 3 A.M. ? '' she asked jocularly . `` A ghost must be hard put to it when he shrieks , '' observed Bouchard , glaring from one to the other . `` It 's all very well for you to make fun of me because you have the advantage of an education , '' said Minna to Marta , `` but you yourself -- you -- '' `` Yes , I did hear what sounded like moaning voices , '' admitted Marta rather sheepishly .