midnight
`` I ca n't , '' said Dexter ; `` it 's too deep . '' `` Well , then , swim . I could swim that with one hand tied behind . '' `` I could n't , '' said Dexter , hesitating , for it was no pleasant task to plunge into the little gliding river at midnight , and with all dark around . `` Now then ! Look alive ! Do n't make a splash . ''