Sci-fi themes
Find your next read by the ideas it interrogates — consciousness, identity, the cost of progress, what survives the future. Every book content-rated with age guidance.
Popular themes
Survival1055Identity884Power617Sacrifice529Coming of Age445War323Political Intrigue302Loyalty268Trust268Friendship250Redemption237Duty229Class Struggle208Self-Discovery190Love188Isolation172Fate vs Free Will151Second Chances145Found Family138Rebellion135Technology133Good vs Evil130Legacy124AI Consciousness123Exploration121Leadership121Freedom117First Contact113Memory113Justice110Community109Family Bonds107Moral Ambiguity106Courage104Colonialism103Belonging101Forbidden Love96Conspiracy94Mystery94Grief87Adaptation84Resilience81Resistance79Revenge77Truth77Hope75Teamwork74Cultural Clash68What Makes Us Human67Humanity's Last Stand61Secrets56Transformation55Government Conspiracy52Heroism51
More themes
Betrayal49Corporate Greed49Reality vs Illusion49Responsibility49Human Nature48Adventure47Family47Humanity's Future47Discovery43Survival Against the Odds43Connection40Time40Apocalypse39Scientific Discovery39Cosmic Horror36Consciousness34Consequences34Existentialism34Humanity vs Technology34Revolution34Brotherhood33Faith33Humanity33Ancient Mysteries32Choice32Military Strategy32Mortality32Problem Solving32Magic31Acceptance30Guilt29Morality29Problem-Solving29Resourcefulness29Scientific Ethics29Self-Reliance29Ambition28Competition28Destiny28Autonomy27What It Means to Be Human27Science26Unity vs Division26Obsession25Trauma25Forbidden Knowledge23Hope vs Despair23Evolution22Family Loyalty22Hope in Darkness22Manipulation22Perseverance22Immortality21Societal Collapse21Survival Against Odds21Corporate Control20Environmental Collapse20Loss and Grief20Moral Compromise20Survival Against Impossible Odds20The Unknown20Fear19Healing from Trauma19Humanity vs Nature19Leadership Under Pressure19Purpose19Self-Acceptance19Betrayal and Trust18Environmental Catastrophe18Hidden Truths18Vengeance18Body Autonomy17Diplomacy17Family Legacy17Innocence17Unintended Consequences17Exploitation16Humor16Interspecies Romance16Medical Ethics16Moral Dilemmas16Motherhood16Partnership16Absurdism15Alien Contact15Desperation15Innovation15Meaning15Totalitarianism15
Niche themes
Cultural Heritage14Empire Building14Human Connection14Human Resilience14Loneliness14Time Paradox14Corruption13Ethics13Existential Threat13Gaming Culture13Healing13Hubris13Individual vs Society13Mental Health13Prejudice13Satire13Self-Worth13Surveillance13War and Its Cost13Bodily Autonomy12Corporate Power12Environmentalism12Espionage12Family Secrets12Friendship Under Pressure12Urban Decay12Virtual Reality12Ancient Civilizations11Consent11Courage Under Fire11Creativity11Extinction11Hidden History11History11Homecoming11Humanity's Place in the Universe11Investigation11Loss11Military Ethics11Military Honor11Alternate History10Community Building10Cultural Conflict10Cultural Exchange10Cultural Preservation10Helping Others10Human-Animal Bond10Humanity Under Pressure10Imagination10Paranoia10Protection10Rebuilding Civilization10Resource Scarcity10Science vs Religion10Social Justice10Strategic Warfare10Technology vs Humanity10Alienation9Captivity9Curiosity9Deception9Dehumanization9Existential Dread9Finding Home9Gender Roles9Growing up9Hidden Identity9Hope Against Odds9Human Extinction9Light vs Darkness9Media Manipulation9Mentorship9Military Brotherhood9Military Life9Nature vs Technology9Persecution9Race Against Time9Reality9Sibling Bond9Starting over9Team Dynamics9Transcendence9Addiction8Camaraderie8Climate Change8Community Under Siege8Conformity vs Individuality8Deception and Truth8Finding Purpose8Generational Conflict8Human Evolution8Human Ingenuity8Human Potential8Love Across Time8Moral Choices8Moral Complexity8Nature vs Nurture8Nostalgia8Overcoming Fear8Parental Love8Power Dynamics8Prophecy8Sisterhood8Social Anxiety8Social Collapse8Social Hierarchy8Survival Against All Odds8Technology and Magic8Time and Consequences8Unity in Crisis8Unlikely Alliances8Unlikely Heroes8Ancient Secrets7Brotherhood in Arms7Collapse of Civilization7Confronting the Past7Empathy7Forgiveness7Government Overreach7Hidden Truth7Home7Honor and Duty7Humanity's Survival7Moral Choice7New Beginnings7Overcoming Adversity7Protecting the Innocent7Questioning Authority7Rebuilding Society7Rescue Mission7Risk and Reward7Sibling Relationships7Social Commentary7Survival Against Overwhelming Odds7Technology vs Magic7Truth Seeking7Alliance Building6Ancient Technology6Bureaucracy6Civil War6Civilization6Colonization6Compassion6Corporate Exploitation6Cultural Identity6Culture Clash6David vs Goliath6Determination6Extinction Threat6Free Will6Government Control6Historical Intervention6Hope Against Despair6Human Condition6Human Enhancement6Kindness6Meaning and Purpose6Military Culture6Oppression and Resistance6Order vs Chaos6Overcoming Prejudice6Overcoming Trauma6Preparedness6Progress6Proving Oneself6Reincarnation6Religious Fanaticism6Social Control6Surveillance State6Systemic Oppression6Technological Ethics6Time Pressure6Transhumanism6Tyranny vs Freedom6Underdog Triumph6American History5Ancient Evil5Chosen Family5Class Divide5Climate Crisis5Complicity5Control5Cooperation5Cross-Species Connection5Cross-Species Romance5Cultural Adaptation5Cultural Assimilation5destiny5Discovery and Exploration5Divine Intervention5Economic Struggle5Existential Crisis5Existential Questions5Fall from Grace5Family Dynamics5Family Dysfunction5Fatherhood5Finding Belonging5Forbidden Desire5Friendship Across Time5Frontier Justice5Frontier Life5Genetic Manipulation5Government Secrecy5Hidden Agendas5Human Progress5Humanity Under Threat5Imperialism5Independence5Inner Demons5Maternal Love5Military Camaraderie5Nation Building5Otherness5Peace vs War5Personal Growth5Playing God5Political Corruption5Power and Corruption5Price of Power5Queer Identity5Rebellion and Resistance5Regret5Revenge vs Justice5Sacrifice for the Greater Good5Scientific Hubris5Scientific Progress5Search for Meaning5Self-Determination5Social Engineering5Social Inequality5Species Survival5State Control5Survival Against Extinction5Technology Gone Wrong5Time Displacement5Truth-Seeking5Unconventional Relationships5War and Consequence5Warfare5