Brinell hardness is a novel written by the Swedish writer Stieg Larsson. This is a fascinating book that tells the story of Mikael Blomqvist, a journalist and director of the Millennium magazine, and Lisbeth Salander, a genius hacker and private detective. Their paths cross in an attempt to unravel the mystery of the disappearance of the young heiress of a defense manufacturing conglomerate. The book explores the complex psychological portraits of the characters, and also traces the important theme of violence and power in modern society. The author reveals the theme of corruption, power, immorality and betrayal, creating a tense plot that keeps the reader in suspense until the last page. Brinell Hardness is a book that will not only entertain you with its intricate plot, but also make you think about complex ethical issues of modern society and deep moral dilemmas.