1 + counter + も ＋ Negative means "no ～ at all; not even one."
日本ごの 本は 一さつも ありません。
There is not even one book written in Japanese.
かいものきゃくは 一人も いません。
There is no shopper at all.
さかなは 一ぴきも いません。
There is no fish at all.
The phrase すこしも can be used instead of "1 + counter + も" to convey the same meaning, except that it is not used with people.
There is no money at all./I don't have any money.