Peter Swanson is the author of five novels, including The Kind Worth Killing, winner of the New England Society Book Award, and finalist for the CWA Ian Fleming Steel Dagger, and Her Every Fear, an NPR book of the year.
The envelope is unremarkable. There is no return address. It contains a single, folded, sheet of white paper.
The envelope drops through the mail slot like any other piece of post. But for the nine complete strangers who receive it – each of them recognising just one name, their own, on the enclosed list – it will be the most life altering letter they ever receive. It could also be the last, as one by one, they start to meet their end.