Eleven-year-old Sophia endeavors to prevent her increasingly forgetful eighty-eight-year-old neighbor and best friend Sophie from entering assisted living, and in the process, uncovers unexpected stories of war, loss, and hope.

"Everyone knows that the two Sophies are best friends. One is in middle school, and one is... well... in a little trouble. At eighty-eight years old, Sophie Gershowitz might be more than triple Sophia Winslow's age, but she's always been on her game, the very best friend any girl struggling to fit in could ever have. The Sophies drink tea, have strong opinions about pretty much everything, and love each other dearly. But lately it seems like the elder Sophie has been losing track of moments in her life--moments that cause Sophia to worry about her, and for worries to build that they might be split apart forever. Young Sophia isn't having it. Not one bit. She sets out to help her best friend, with the of her neighborhood pals Ralphie and Oliver. But when she succeeds in opening the floodgates of elder Sophie's memories, she finds that there is more to her beloved companion than she ever could have anticipated. Lois Lowry once again showcases her mastery in this unforgettable tale of friendship. In a work that stretches from a war-torn country to a quiet New Hampshire cul-de-sac, from old homes back to new, intertwined with touching moments of levity and poignancy, Lowry demonstrates the value of sharing--and making--memories." -- Book jacket.