Book #4
Boris Akunin, Внеклассное чтение (Extracurricular Reading). Both volumes.
Russian language.
Nicholas Fandorin's adventures in Moscow in 2001 are told together with a story of a 7-year-old prodigy entangled in a plot at the end of Catherine the Great's reign.
Book #5
P.G. Wodehouse, My Man Jeeves
I simply adore Wodehouse. If you haven't read his books yet, you should! It's British humor at its best.
Book #6
Boris Akunin, Сказки для идиотов (Fairy Tales for Idiots)
Russian language. A collection of short stories based on the events in recent Russian history. Funny and sad at the same time.
Book #7
Heinrich Böll, House without Guardians
A story of two boys and the adults around them dealing with life after WWII.