Victor Appleton was a house pseudonym used by the Stratemeyer Syndicate and its successors, most famous for being associated with the Tom Swift series of books. https://en.wikipedia.org/wiki/Victor_...
The character of Tom Swift was conceived in 1910 by Edward Stratemeyer, founder of the Stratemeyer Syndicate, a book-packaging company. Stratemeyer invented the series to capitalize on the market for children's science adventure. The Syndicate's authors created the Tom Swift books by first preparing an outline with all the plot elements, followed by drafting and editing the detailed manuscript. The books were published under the house name of Victor Appleton. Edward Stratemeyer and Howard Garis wrote most of the volumes in the original series; Stratemeyer's daughter, Harriet Stratemeyer Adams, wrote the last three volumes. The first Tom Swift series ended in 1941. In 1954, Harriet Adams created the Tom Swift, Jr., series, which was published under the name "Victor Appleton II". Most titles were outlined and plotted by Adams. The texts were written by various writers, among them William Dougherty, John Almquist, Richard Sklar, James Duncan Lawrence, Tom Mulvey and Richard McKenna. The Tom Swift, Jr., series ended in 1971. https://en.wikipedia.org/wiki/Tom_Swift
In this volume, Tom and his friends travel to the Belgian Congo to explore caves that are emitting radiation. Interacting with friendly and unfriendly natives, Tom and his crew are locked in a battle against several white men who seek to keep the secret caves to themselves.
The science is a bit wonky and Tom never fails to come up with quick solutions to seemingly difficult challenges. Like the Hardy Boys, money is no object and he continually escapes from dangerous situations by the narrowest of margins. This particular volume had several escapes that seemed to be more wild and unlikely than the ones before.
I think the plot is weak and Chow's speech is a bit much after a while. The stereotypical interactions with natives in awe of the white man's science are also very old and tired. I don't recommend this volume for young children as it doesn't stand the test of time very well.