Charles and Kate Sheridan are back investigating murder, this time at a motorcar show and balloon race that Charles has been strong-armed into hosting. I found the journey in this book to be more entertaining than the solution. The look at the early years of the auto industry is entertaining-- maximum speed is a rollicking twelve miles per hour. Speed demons abound! This series also features cameos by historical figures: in this one we get a version of the first meeting between Charlie Rolls and Henry Royce. I've never managed to figure out why Charles puts up with his friend's car mania and irresponsibility, but that gives us the plot of the book, and it is entertaining enough.