The first one is a book by Ilya Velchev - "Бай Ганьо, жив ли си?" (freely translated as "Baj Ganio, are you alive?"). Baj Ganio is a notorious fictional Bulgarian character.
Book cover for a book by Ivo Milev - "Случаите на инспектор Тюхчев" (freely translated as "Detective Tiuhchev's cases").
Agatha Christie's book "The murder on the links":
"Red dragon" by Thomas Harris, the first novel to feature Dr. Hannibal Lecter.