Following her twin brother Felix's death and her split with Nathan, her partner of ten years, Greta's physician suggests electroconvulsive therapy to combat her feelings of depression and loneliness. What Greta doesn't expect, however, is that each of the sessions somehow transports her into other versions of herself in one of several alternate time periods, including Greta of 1918 and Greta of 1941. In each of these separate realities, her close family and friends remain consistent, but their lives have played out differently, and Greta gets the feeling that her counterparts are trading places with her and living her 1985 life just as she is spending time in theirs. What happens when the twenty-five procedures have concluded?
I really relish stories about time travel, although I suppose Greta's experience is something more like dimension travel. I wondered constantly about the other Gretas and what they were thinking and feeling. I was sort of expecting them leave notes for one another or otherwise attempt to communicate in some way, if only to share the feeling of "WOW! Isn't this crazy what is happening to us?" I enjoyed the book, though it fell a little short of "unputdownable."