Library Journal
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Best-selling author Perry brings back longtime Victorian-era favorites the Pitts (Treason at Lisson Grove). A traitor is hidden in the very ranks of the Special Branch, and when a retired spy is murdered, the couple know time is running out for his unit's mission. [See Prepub Alert, 9/30/11.] (c) Copyright 2012. Library Journals LLC, a wholly owned subsidiary of Media Source, Inc. No redistribution permitted.

Book list
From Booklist, Copyright © American Library Association. Used with permission.

The Charlotte and Thomas Pitt series continues to roll smoothly along. It's now 1896, and Thomas, in charge temporarily of Special Branch, has the unpleasant job of turning his investigative eye on his own people, looking for a mole in the organization. Meanwhile, Charlotte helps Thomas explore whether the death of a former spy has the potential to plunge Britain into full-scale war. As usual, the plotting is rock solid, with a terrorism-themed mystery that will resonate with contemporary readers, but it's the characters and their environment that make the book such a pleasure to read. Perry's Victorian England is well drawn, a broad-stroke portrait that gives readers the spirit of the time and place without getting mired down in too much detail, and Charlotte and Thomas remain two of the most vividly conceived protagonists in the historical-mystery genre. Another fine entry in an always entertaining series.--Pitt, David Copyright 2010 Booklist

Publishers Weekly
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Scotland Yard's Thomas Pitt worries about his fitness as head of Special Branch, a post he officially assumes in early 1896, in bestseller Perry's suspenseful 27th novel featuring Pitt and his wife, Charlotte (after 2011's Treason at Lisson Grove). When Pitt gets reports from his staff that someone has been asking questions about railway signals and points, he's concerned that the inquiries might be a prelude to an assassination attempt during a train journey, though the target is at first unclear. Unfortunately, getting others in the British government to share his worries proves an uphill slog. And even with additional resources, figuring out the who, the what, and the when to prevent a crime that could have international repercussions isn't easy. Perry convincingly demonstrates that this long-running series hasn't run out of steam, and breathes new life into it by giving her capable lead new responsibilities and new challenges. Agent: Donald Maass, Donald Maass Literary Agency. (Apr.) (c) Copyright PWxyz, LLC. All rights reserved.