Like every other book of Agatha's that I've read I was absorbed. Yet with this particular one, it took a bit. The story as a whole was good, but was thinner than some of her other work. I know now that it was only her second publication, and it makes sense. I wanted more of Tuppence and Tommy; I was well into the story before I really cared for them. It may be that if it was any other detective story, I might not have continued after the first chapter or so. However, because I've grown to trust Agatha, I knew she would make me happy in the end. And she did.
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The two main characters grow close, despite their uptight Englishness - which Agatha seems to be poking fun at throughout the book - and we are left wanting more of them both. I liked best a portion of the book where Tommy finds himself caught in the nasty rendezvous of the well organized anarchists. While hidden away, Tommy sees and hears many of the members arrive and report to a meeting. They gather around a table, at the head of which sits a bearded German. Each crook gives a number instead of their name, each one coming from a different level of society, and some from different countries. Eventually Tommy is caught, we have to wait many chapters to find out if he's alive, but the descriptions of the evildoers are classic.