Title: End Times (book)
Content:  End Times: A Brief Guide to the End of the World is a 2019 non-fiction book by journalist Bryan Walsh. The book discusses various risks of human extinction, including asteroids, volcanos, nuclear war, global warming, pathogens, biotech, AI, and extraterrestrial intelligence. The book includes interviews with astronomers, anthropologists, biologists, climatologists, geologists, and other scholars. The book advocates strongly for greater action.
Title: Endworld
Content:  Endworld is a series of post-apocalyptic novels written by David L. Robbins. The first book was published in 1986. As of 2014, there have been 29 novels written in the series. David Robbins also wrote a 13 novel spin-off to this series called Blade. The series begins 100 years after World War III, a nuclear war between the United States and the Soviet Union. The series revolves around the predecessors of The Family, a survivalist group living in an isolated compound, called The Home, located in north-western Minnesota and their attempts to venture outside their secure home for the first time since the war. The United States itself was ravaged by nuclear, biological and chemical weapons and has become a dangerous place. Very little is known outside the country. In the novels, the Family's protectors, known as the Warriors, travel to cities and territories, usually dealing with some sort of threat to The Home such as dictators, mutants, etc. The leader of the Warriors, Blade, is the most prominent character.
Title: The Earthend Saga
Content:  In May 2016, Anderson announced that the book series was sold to be made into a TV series.
Title: The Phoenix Files
Content:  Doomsday is the final book of the series. There are no more days left. After ninety-nine days of lockdown, the annihilation of the human race is right on schedule. Luke and Jordan are fighting a losing battle. Peter has escaped, Bill has disappeared, and Co-operative Security are moments away from storming the Vattel Complex. As the battle rages on in town, an offer of help arrives from the last place anyone could have expected (Calvin). But can it really be trusted, or is this just another one of Shackleton's deceptions? And with the murder still looming over Luke, will he even live long enough to find out (he lives)? One way or another, it's all coming to an end. The clock is still ticking. There are seventeen hours until the end of the world.
Title: World of Trouble
Content:  such as armed gangs, intact communities, surviving families, former illegal immigrants, delusional survivalists or religious groups, and an Amish community to which he returns to spend the end of the world with after he finds and makes peace with Nico's killer. The novel and series end with Maia about to impact on the far side of the world as Palace and the Amish community sit down to begin a meal that will abruptly end with the unfolding tragedy on the other side of the world, all but Palace and two members of the Amish host family oblivious about their imminent fate. As 2011GV1 begins its entry into the Earth's atmosphere, seconds before impact, Palace ends his story and the series.
Title: Hard-Boiled Wonderland and the End of the World
Content:  The End of the World narrative was one of the inspirations for Yoshitoshi ABe's Haibane Renmei, originally produced as a manga and later adapted as an anime series. Both works feature a city that people are not allowed to leave, with a wall, a river, a library, and a clock tower.
Title: World Without End (Follett novel)
Content:  World Without End is a best-selling 2007 novel by Welsh author Ken Follett. It is the second book in the Kingsbridge Series, and is the sequel to 1989's The Pillars of the Earth. World Without End takes place in the same fictional town as Pillars of the Earth — Kingsbridge — and features the descendants of some Pillars characters 157 years later. The plot incorporates two major historical events, the start of the Hundred Years' War and the Black Death. The author was inspired by real historical events relating to the Cathedral of Santa María in Vitoria-Gasteiz. A television miniseries based on the novel aired worldwide in 2012. It premiered on Showcase in Canada on 4 September 2012; in the United States on Reelz Channel on 17 October 2012; on Channel 4 in the UK on 22 December, and on Star Movies in the Philippines in January 2013. The eight-part television event miniseries stars Cynthia Nixon, Miranda Richardson, Peter Firth, Ben Chaplin, Charlotte Riley, Sarah Gadon and Tom Weston-Jones. It was directed by Michael Caton-Jones who also directed the historical epic Rob Roy.
Title: The World at the End of Time
Content:  World at the End of Time is a 1990 hard science fiction novel by American writer Frederik Pohl. It tells the parallel stories of a human and a plasma-based intelligence who manage to survive to the time near the heat death of the universe. The book is thus a combined work in speculative cosmology and space colonization.
Title: The Earthend Saga
Content:  The EarthEnd Saga is a science fiction novel series co-written by actress Gillian Anderson and writer Jeff Rovin. The first book, A Vision of Fire was first released in October 2014. A Dream of Ice was published a little more than one year later, in December 2015. The third book of the novel series is titled The Sound of Seas was published in September 2016. The series been translated into Finnish, French, Portuguese and Polish.
Title: The Pocket Guide to the Apocalypse
Content:  The Pocket Guide to the Apocalypse: The Official Field Manual for the End of the World, written by Jason Boyett and published by Relevant Books, is a caricature of eschatology, the apocalypse, and the end times.

Question: book series about the end of the world?
Answer: Left Behind.