On the first page of The Book Borrower, Toby Ruben and Deborah Laidlaw meet in 1975 in a New York City playground, where the two women are looking after their babies. Deborah lends Toby a book, Trolley Girl, - a memoir about a long ago trolley strike and three Jewish sisters, one a fiery revolutionary - that will disappear and reappear throughout the twenty-two years these women are friends.Through two decades Deborah and Toby raise their children, embark on teaching careers, and argue about politics, education, and their own lives. One day during a hike, they have an argument that cannot be resolved - and the two women take different, permanent paths - but it is ultimately the borrowed book that will bring them back together. With sensitivity and grace, Alice Mattison shows how books can rescue us from our deepest sorrows; how the events of the outside world play into our private lives; and how the bonds between women are enduring, mysterious, and laced with surprise.