Retributions: Don't Tell Me It's Another Bloody E-mail

An explosion in an empty bookshop, that harms nobody, is followed by a string of murders that have no apparent motive to connect them to each other. The method of killing varies between them, and apart from those who are murdered together, none of them are known to each other.Yet all of them are being claimed by the same killer, in a series of e-mails sent to the investigating officers.Each new mu...