This is not really a challenge - I don't have a goal of this many read books in mind or anything. I'm simply imposing a book-buying ban on myself until I make a dent in my physical TBR pile. For each, say, five read books I'll allow myself the possibility to buy one.
1. Ольга Птицева, "Двести третий день зимы"
2. Without a Trace (Nancy Drew: Girl Detective #1) - Carolyn Keene
3. A Little Princess - Frances Hodgson Burnett
4. Among Others - Jo Walton
5. Дарья Бобылева, "Наш двор"
6. Horrorstör - Grady Hendrix
7. Мариэтта Чудакова, "О "закатном романе" Михаила Булгакова. История создания и первой публикации романа "Мастер и Маргарита""
8. Day of the Oprichnik - Vladimir Sorokin
9. Bonjour Tristesse - Françoise Sagan
10. Ottoline and the Yellow Cat - Chris Riddell 
11. Ольга Матич, "Музеи смерти. Парижские и московские кладбища"
12. Secrets Can Kill; Deadly Intent; Murder on Ice (Nancy Drew Files Vol. I) - Carolyn Keene
13. Goth Girl and the Ghost of a Mouse - Chris Riddell