In 1815, an inquiry agent, Mr. Knighton Gaunt, is asked by Lord Crowley to attend a séance with the express purpose of revealing the spiritualist as a fraud. When the séance ends abruptly, Lord Crowley is poisoned during the turmoil by an unseen killer. Gaunt is now left to investigate not only fraud, but murder. Suspicion turns first to the spiritualist, Miss Prudence Barnard, but as Gaunt digs deeper into the twisted history of the guests at Rosecrest, he discovers more deadly secrets. Inevitably, long-time friends turn against one another as the tension mounts, and Gaunt is challenged time and time again to separate fact from fiction before another death at Rosecrest. The Vital Principle is the first mystery in the Second Sons Inquiry Agency series and features coolly intellectual Mr. Knighton Gaunt, the agency's founder. This witty, historical whodunit in the tradition of Bruce Alexander's Blind Justice, will keep you guessing until the unexpected end.