At last, book number 7 in the series and Ned Nickerson appears! (Nancy Drew's boyfriend who finally and bravely is written into the series.)
This mystery is fairly standard, like a paint-by-numbers book on how to write a mystery for twelve-year old girls born in the 1930s. Nancy comes upon a burning house, witnesses a man fleeing from it, does some 'sleuthing' and finds both a signet ring and diary near the house, but then she can't get away from the property due to all the fire trucks AND dozens of cars belonging to spectators who arrive to watch the fire burn. (Later in the book Nancy says there are very few houses near this one, and that there really are no neighbors. So where did everyone come from? I dunno.) Anyhow it's Ned-to-the-rescue who moves Nancy's car, a fancy convertible, away from the raging fire, and also serves as traffic cop to get everyone off and onto the road when it's over.
I DO tend to believe that everyone nearby would race to their car and to the fire. I believe it. I've seen newsreels from the 1930's and 40's where people are just jamming a famous person leaving a courtroom or scrambling over each other so they can talk to or touch a celebrity. And police officers? I don't know where they are. So I suppose it is plausible that in an area with a house in the middle of nowhere there would be dozens of spectators clamoring...
I'm off on a tangent! The most important part of this initial scene is NOT the fire, per se, but the arrival of Nick. Nick will now be the second man in Nancy's life, after father, prominent lawyer, Carson Drew. But Nick will surpass Nancy's father in importance because he will assume a real role in all her future mysteries. He will be the go-to guy, the one who can be with Nancy when she investigates some old building or factory or abandoned whatever. Even Mrs. Hannah Gruen, the Drew family housekeeper tells Nancy that she needs to have 'a man' with her when she goes off to do something which is dicey or dangerous.
(Sorry, Nancy, you could only go solo for six adventures because now you need a man.)
Too much digression. This mystery involves arson and the possible murder of a shady guy, Felix Raybolt, who steals inventors' ideas and sells them, keeping the profits to himself. There aren't really a lot of interesting twists and turns and Nancy is neither sideswiped by a car or grabbed by an ominous stranger or tied up or anything like that. She follows 'clues' one by one to discover what really was going on in the burned-down house and what Raybolt, if he's guilty, was up to. Along the way she and her friends (and Nick!) help yet (another) poor woman with a child to raise on limited income.
(Nancy and her friends buy the woman groceries, then later clothes for the child. Nancy is awesome, you know. She also cautions another character that if he goes to trial for the arson, etc., her dad, prominent lawyer Carson Drew, will defend him for no charge.)
But there's that theme, or trope again, which I mentioned in earlier Nancy Drew mystery reviews: the poor woman with children, or two older women, or young girls, etc., who have 'no means of support' unless Nancy can free their male relative, or prove that someone's stealing from them, or if she can find the hidden --- whatever --- which contains information which will provide (somehow) the poor woman with children an income or funds or jewels.
Women are so darn helpless in these books, except for our intrepid heroine, Nancy Drew, of course. And she does save the day. And party at a fraternity. And have lunch at a teahouse. (There are teahouses everywhere in Nancy's world.) And explore an abandoned shack. And meet the dream boyfriend of every-1930's-era-girl: tall, blond and charming Ned Nickerson.