about midnight
`` Well , I think I 've got a clue . '' `` You have ! Come on , let 's hear it quick , '' cried Rob . `` Well , I was up late with Paul Perkins last night , talking over the aeroplane model competition , and did n't start home till about midnight . As I was approaching the armory I thought I saw a light in one of the windows . I could n't be certain , however , and I put it down to a trick that my eyes had played me . '' `` Well , that 's all right as far as it goes , '' burst out Rob .