midnight
`` I must go back to camp , '' he said . `` But there is a meeting to-night , '' Van Ellis urged . `` An important one , '' Gostel put in . `` And a midnight visit to the dam , '' Itto said . `` I have a previous engagement at the camp , '' Harvey insisted . `` We have guests from New York , my son and myself . '' `` The secret service lads , '' exclaimed Gostel , scornfully .