"To have a book that marries real London life, time travel, and relativity in an illuminating and entertaining way is stuff I used to dream about. I had The Upper World in my hands until I finished it. So happy this exists." - Daniel Kaluuya
"A time-twisting, mind-bending thrill ride. If I could read at the speed of light, I would have!" - Holly Jackson, #1 New York Times bestselling author of A Good Girl's Guide to Murder
"The Upper World took everything I thought I knew about physics, time, space, and energy, and twisted it into a new, electrifying story that I couldn't put down!" - Brittney Morris, nationally bestselling author of Slay
“A mind-bending thriller that takes you to modern-day London and then twists reality back in on itself. Tenet has nothing on The Upper World.” - Maureen Johnson, New York Times bestselling author of the Truly Devious series
“An intense debut novel...The science is complex, but the central, emotional stakes are universal: Can we change the past? Dare we hope for a better future?" - Booklist
"Exploring themes including fate, gang violence, and the ethics of time travel, debut author Fadugba uses physics theories to create an absorbing dual narrative with engaging voices." - Publishers Weekly
"Fadugba’s debut dazzles, particularly when it comes to dialogue—the London slang flows with ease. A riveting thriller that creatively incorporates scientific elements." - Kirkus Reviews
“So much is packed into this relatively short audiobook…. But at its heart, it is a story of connection: to ourselves, others, and our communities. Important and relatable for all.” - Booklist (starred review)
“Fans of Jason Reynolds and Neal Shusterman won’t be able to put down this electrifying debut.” - School Library Journal