Slacks for Ella Funt

I think I saw this on a best mysteries of the year list somewhere, so I added it to my library hold list. For a book billing itself as a mystery, everything that went on seemed pretty obvious from the very beginning of the book. Unreliably narrator has a probably crazy sister who thinks her husband killed their son. Not so surprising when she does turn out the be crazy and the husband probably did kill the son. I guess it was supposed to also be a psychological thriller, but everything about it seemed so obvious that it was mostly boring.