The Case of the Counting Numbers

The Tandons of Lucknow have three prodigious children — Raju, Anju and Lali. The elder ones are very intelligent as well as disciplined. So is their youngest sister, a three years old cute child prodigy. Lali has a unique flair for counting whatever comes her way.
The Tandons live in a Society flat on an upper floor and sometimes their children stay back when they go out. The children have a hawk’s eye. Once in absence of their parents what they saw helped in solving a case of burglary in the Society.
One of their neighbouring families, staying in a ground floor flat, is away for an urgent work. Their house is burgled. When police intervene, lack of clues gives them a run for their investigating skill. Many people are cross-examined but the final clue eludes.
Then the three children give a photographic account of the day when burglary took place. After all analysis Lali’s headcount leads to the actual burglar. What geniuses these children possess? What counting enigma Lali is?
Read the book to get your answers.