We do not simply live with fear; we live inside it. Like a persistent fog, fear does not always appear in explicit or dramatic forms, yet it silently conditions our decisions, expectations, and relationships. A concrete threat is not required for it to be present; a diffuse sense that something could go wrong at any moment is enough. Fear is no longer an exceptional episode; it has become the emotional climate of our time. The twenty-first century did not create this atmosphere, but it did consolidate it. Global financial crises, terrorist attacks, pandemics, wars broadcast in real time, climate collapse announced as inevitable, and accelerated technological transformations have eroded the idea of stability. The modern promise of continuous progress was replaced by a more modest and more unsettling certainty: nothing is guaranteed. The future, which for decades was synonymous with advancement, is now perceived as a latent threat. This permanent state of alert is not merely an individual psychological reaction. It is a social condition, carefully cultivated and managed. Fear seeps into headlines, political speeches, expert warnings, and the algorithms that decide what we see and what we ignore. It is presented as a rational response to a dangerous world, yet there is rarely scrutiny of who defines that danger, how it is communicated, and who benefits from its amplification. Everyday life is organized around this logic. We choose jobs not out of vocation but for security; we accept precarious conditions out of fear of losing everything; we tolerate surveillance in exchange for protection; we sacrifice rights in the name of order. Fear does not necessarily paralyze-it disciplines. It does not always shout-it whispers. It does not force-it persuades. It integrates itself into routine until it becomes invisible, like the background noise of a city no one notices anymore. In this context, insecurity ceases to be a problem to solve and becomes a resource to manage. Where fear becomes constant, a market emerges ready to offer relief: insurance, surveillance systems, risk consultancies, tough-on-crime rhetoric, "safe haven" financial products, closed political identities. It does not matter whether the solution works; it is enough that it promises containment. Sustained anxiety guarantees sustained demand. But this economy of fear is not limited to consumption. It also structures power. Governing through fear is more effective than governing through hope. A frightened citizenry demands protection before participation, order before justice, stability before change. Fear reduces the complexity of the world to simple dichotomies-security or chaos, us or them-and within that simplification flourish decisions that, in another context, would be unacceptable. Fear also fragments. It makes us more distrustful of others, more vulnerable to narratives of threat, more willing to seek visible culprits for structural anxieties. Instead of questioning unequal economic systems or failing institutions, channeled fear points to immediate enemies: the foreigner, the dissident, the poor, the different. In this way, real insecurity is displaced into symbolic conflicts that do not resolve it, but do reproduce it. This book starts from an uncomfortable premise: contemporary fear is not only the result of a dangerous world, but also the product of a model that needs the perception of danger in order to sustain itself. This is not about denying real threats-violence, the climate crisis, inequality, democratic fragility-but about understanding how they are transformed into a permanent atmosphere that benefits a few while weakening the many.