Selfie with fate

In the store "Folk Principles" in the village of Sokolnichy, a rich lady was found strangled. She often visited the village, generously donated to restore the bell tower and was respected. The criminal - the drunkenness staggering nearby - was detained in hot pursuit ... Professor Ilya Subbotin comes to the village to establish the truth. The physics teacher has a strange hobby - he solves crimes. All hope is on him, for no one will dig deeper, the matter is closed. A strange company gathers in Sokolnichye around Ilya: a poetess with dreadlocks, a sad beauty in furs, a cheerful couple busy with a selfie on the Internet, a guide that is clearly hiding something eccentric guy, and even a fucked kind of gentleman.
One of them killed a respectable lady. But who? And why?