I am near the end (and owe lots of reviews, maybe tonight) but must pause in mid-novel to say that Passenger to Frankfurt is the absolute worst Christie novel ever. Endless old people rambling about how the young drug-taking promiscuous protestors of today are secretly inveigled by Nazis who are basically worshiping Hitler's secret (fake) son from Argentina. The backstory of how Hitler escaped was amazing though: he went to an insane asylum where there were lots of guys who thought they were Hitler, and switched places with one of them. OK.....right! The book is hideously boring. I'm not sure I can finish it.