This psychological thriller was good enough to make the Summer Reading Guide, but I ran out of room! A British single mother gives her 8-year-old son permission to run ahead a little on their evening walk in the park ... and he disappears, without a trace. MacMillan invites the reader to come along on the hunt for the boy, alternately focusing on police procedure and family drama. The tight writing and sharp execution made this hard to put down. I've seen a lot of comparisons to The Girl on the Train, but instead I'd recommend this one for Tana French fans.

“A wonderfully addictive book with virtuoso plotting and characters - for anyone who loved Girl on the Train, it’s a must read.” — Rosamund Lupton

I've read and enjoyed previous books by Macmillan, like What She Knew and The Perfect Girl. I wasn't sure if I was going to read this one, but then my mystery-loving (and mystery-writing loving friends chimed to tell me how much they loved it. One reviewer described this as "a twisted version of Downton Abbey gone very, very wrong."