Overall, I quite liked this book as a quick-read thriller. The switching between characters and times kept me on my toes, and I appreciated the work the author seemed to have put into researching and understanding addiction and traumatic brain injuries. I can definitely see the comparisons to The Girl on the Train, given the main character (Alex) and her barely functional alcoholism / difficulty letting go of her ex-husband / etc..., although Alex is a much more reliable narrator than Rachel was and is much clearer about what she does and does not know. And while I was able to figure out whodunnit by maybe the midpoint of the book, I felt like it was clear why the main characters hadn't and there were still enough details to discover to keep me reading til the end. Would definitely recommend to anyone looking for something quick to read and not overly complex.