I picked this one up at the library used for 50 cents. Looks to be about two women, Toby Ruben and Deborah Lardlaw, who meet one day while watching their children on a playground in 1975. Deborah lends Toby a book, and it keeps showing back up in their lives. They disagree about things but it seems their friendship can weather it, until one day they have an argument they can't ignore. The back of the book tells that the borrowed book eventually brings them back together, which I hope isn't a spoiler.

Seems interesting, will be read and released.

Looks like a great novel.