six o’clock
I was a donkey to have believed she did . '' Then , with the suppleness of a serpent , he slipped under the bed . Presently we heard him ask : `` At what time , Monsieur Jacques , did Monsieur and Mademoiselle Stangerson arrive at the laboratory ? '' `` At six o'clock . '' The voice of Rouletabille continued : `` Yes , -- he 's been under here , -- that 's certain ; in fact , there was no where else where he could have hidden himself . Here , too , are the marks of his hobnails . When you entered -- all four of you -- did you look under the bed ? ''