Search for a woman in small photos

[Роберт]

It is still possible, but it will be the most expensive pleasure.
Get lists of numbers of all phones that were in this triangle at this time.
Next, create a women's list in which number 1 called number 2.
Number 1 - pin 1 of the girl.
Number 2 - contact 2 girls.

or so:
Video recording from surveillance cameras.

There are not so many cameras in St. Petersburg. As for phones, if it’s Nevsky, then at least 1,500 subscribers.