The Square Root of Summer

My heart is a kaleidoscope, and when we kiss it makes my world unravel . . .

Last summer, Gottie's life fell apart. Her beloved grandfather Grey died and Jason left her - the boy to whom she lost her virginity (and her heart) - and he wouldn't even hold her hand at the funeral! This summer, still reeling from twin heartbreaks, Gottie is lost and alone and burying herself in equations. Until, after five years absence, Thomas comes home: former boy next door. Former best friend. Former everything. And as life turns upside down again she starts to experience strange blips in time - back to last summer, back to what she should have seen then . . .

During one long, hazy summer, Gottie navigates grief, world-stopping kisses and rips in the space-time continuum, as she tries to reconcile her first heartbreak with her last.


Praise for The Square Root of Summer

A Teen Vogue Best New Book of 2016

An American Booksellers Association "Indies Introduce New Voices" selection winter/spring 2016

An American Booksellers Association "Indie Next" pick for Summer 2016

“[T]he delectable romance and the moment when past, present and future all come together and semi-solve the mysteries of Gottie’s time travel make the journey worthwhile.” The New York Times

“Novelist Harriet Reuter Hapgood’s electric YA debut, The Square Root of Summer, reminds us that time is a healer.” Buzzfeed

“Reminiscent of a modern-day Brideshead Revisited, it has a real bohemian vibe.” South Wales Evening Post, five-star review

“While this book does deliver on the title's promise of teenage vacation hijinks, romance, and mathematical equations, it also presents a heartrending quandary: How to move forward with a life that has been defined by loss . . . It presents an earnest picture of the way loss ripples through a family and shapes the movements of everyone it touches."  NPR

“Harriet Reuter Hapgood delivers a clever and compelling story of love, loss and resilience . . . an exciting, shouldn't-miss debut with a fresh and enthralling time-travel twist.USA Today, Happily Ever After

“Gottie might just be our next favorite YA heroine.Hello Giggles

“The Square Root of Summer proves that time travel and young love go hand in hand.Mashable

“An epic romance with twists that will leave you breathless."  Kami Garcia, #1 New York Times bestselling co-author of Beautiful Creatures and author of The Lovely Reckless

“Sophisticated and believable . . . An emotional roller-coaster ride worth taking."  School Library Journal, starred review

“A story of complex grief, love, and growth."  Kirkus Reviews

“[Reuter] Hapgood’s novel will lodge in the hearts of readers."  Booklist

“A poignant portrait of a girl struggling with loss and love, this novel is equal parts heart and smarts, with a dash of friends-turned-more sweetness."  BCCB

“Set to be one of the most talked-about YA debuts of 2016. Love, loss and heartbreak told in a wholly authentic teenage voice."  The Bookseller, one to watch

“An atmospheric, romantic, and beautifully-written puzzle of a book, starring a lovably unconventional cast of characters. You won't want to put this book down for even a second until you've pieced the whole thing together."  Leila Sales, author of This Song Will Save Your Life and Once Was a Time

“It is so idiosyncratic that it really becomes set apart from other YA books. Perplexing at first... but [it] is extraordinary." Guardian Children's Books


The Square Root of Summer is out in the US, UK and audiobook, to be followed by publication in Brazil, France, Spain, Italy, Russia and Turkey.

To order in the US, find your local independent bookstore at IndieBound. To order in the UK, find your local independent bookshop at Hive. I like the magical Tales On Moon Lane in Herne Hill in south London. Waterstones has an exclusive edition with neon pink edges.


If you have a Kindle, or use iBooks or Kobo or the like, you can also download a New Adult e-novella I wrote for Hot Key Books Unlocked back in December 2013.