Two years ago, a hostile Prime Minister launched the Monochrome inquiry, investigating "historical over-reaching" by the British Secret Service. Monochrome’s mission was to ferret out any misconduct by any MI5 officer --- and allowed Griselda Fleet and Malcolm Kyle, the two civil servants seconded to the project, access to all confidential information in the Service archives. Now that the administration that created Monochrome has been ousted, the investigation is a total bust --- and Griselda and Malcolm are stuck watching as their career prospects are washed away. Until the eve of Monochrome’s shuttering, when an MI5 case file appears without explanation. It is the buried history of a classified operation in 1994 Berlin whose cover-up has rewritten 30 years of Service history.

Mick Herron, author of the Slough House novels, is on his way to becoming one of the most critically acclaimed and culturally important crime fiction writers of the 21st century. He has been awarded both the Gold and Steel Daggers by the Crime Writers’ Association and has been called “the John le Carré of the future” (BBC). Now, for the first time, his short fiction has been collected into one volume. Five stand-alone nerve-rackingly thrilling crime fiction stories are complemented by four mystery stories featuring the Oxford wife-and-husband detective team of shrewd Zoë Boehm and hapless Joe Silvermann. The collection also includes a peek into the past of Jackson Lamb, the irascible top agent at Slough House.

John Bachelor is the saddest kind of spy: not a joe in the field, not even a desk jockey, but a milkman --- a part-time pension administrator whose main job is to check in on aging retired spies. Late in his career and having lost his wife, his house and his savings after a series of unlucky choices, John has been living in a dead man's London apartment, hoping the bureaucracy isn't going to catch up with him and leave him homeless. But keeping a secret among spies is a fool's errand, and now John has made himself eminently blackmailable.

Twenty-six-year-old Maggie Barnes is someone you would never look at twice. Living alone in a month-to-month sublet in the huge city of London, with no family but an estranged sister, no boyfriend or partner, and not much in the way of friends, Maggie is just the kind of person who could vanish from the face of the earth without anyone taking notice. Or just the kind of person MI5 needs to infiltrate the establishment and thwart an international plot that puts all of Britain at risk. Now one young woman has the chance to be a hero --- if she can think quickly enough to stay alive.