“Duty Day” is a book that tells about the difficulties and dangers of the lives of people who guard the quiet life of society. Fulfilling their duty with dignity, they also remain simple people with their own personal stories. The intricate interweaving of professional investigations and personal experiences of the characters keeps the reader in constant suspense, forcing not only to follow the turn of events, but also to sincerely empathize with the characters in their matters of the heart.