Mitra wrote a small novel and nearly after three years, it was published in Ramdhonu [রামধনু] (The Rainbow) (a magazine for children edited by Manaranjan Bhattacharya).
In that year, all of the main cities on the western side of longitude 70° West of South America ruined in a single day by an under-earth attack.
They also used advanced technological weapons, for example, the Ants used a kind of searching, powerful light, somewhat green in colour that took away human sight in an instant.
The third narration is by Senor Sabatini [সেনর সাবাতিনি], a famous writer of Rio de Janeiro who describes the third deadly attack.
Mitra concludes this novel with declaration that the whole mankind is united, forgetting their internal enmity, to fight their common enemy.
As observed by Debjani Sengupta in her essay Sadhanbabu's Friends: Science Fiction in Bengal from 1882-1961: "...Mitra hints at a time when the very existence of humans will be endangered, when common flowers and trees will be a thing of the past.