The Poisoned Chocolates Case

The principal first-thus trap is the 2016 British Library Crime Classics edition, which is not merely a reprint: it adds an introduction and new epilogue by Martin Edwards, an alternative ending by Christianna Brand (written for a 1979 US re-release and first collected there), and a further new solution devised by Edwards — a materially different text. Later Collins impressions are noted on the verso; later Doubleday/Crime Club printings are identified by the ABSENCE of the 'First Edition' statement.