I enjoyed this story a lot. Written as a long narrative exposition from the main character Annie to her son, back and forth from past to present, the writing is beautiful, honest, and at times poetic. Where I think the story-to-son format, though compelling and different, becomes a letdown is when the story stops near the end, presumably because Annie doesn't write (and wouldn't have--true to the format) about her trip to tell her son the truth. It felt like a gap as I wanted to know exactly what happened. 
 Regarding the blurb, it's not much like The Girl on the Train, but it IS like Everything I Never Told You only, I thought, with more focus. If you are a sucker for family dramas like I am, you'd probably enjoy this too.