ten o'clock
`` You would n't think he 'd come out from the woods at all -- especially when there 's such a bright moon . He might be sure some one would see him . '' `` Oh , I do n't know , '' said Billie thoughtfully . `` He probably knows the rules of Three Towers and that the girls are all supposed to be in bed before ten o'clock , and I suppose he felt safe enough . We _ should _ have been in bed , you know , '' she added , dimpling mischievously . `` But I wonder what he was sneaking around Three Towers for , '' Laura went on , unwilling to change the subject . For to Laura , mysteries were the very breath of life .