An alien probe found wrecked on one of Jupiter's moons and containing insane "intelligence" is stole from a laboratory before its secret of stardrive is obtained.
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
I enjoyed the Tom Swift Jr books that I read around 1970. They were the books that got me interested in science fiction, science, and technology. Many years later when I was buying presents for nieces and nephews, the Tom Swift III series, is the only Tom Swift books that I could find in bookstores. As it turns out I didn't get around to giving them all away. Recently I read these books before getting rid of them. I found the writing to be terrible and the plots to be very simple. Maybe the ones I read in 1970 were just as bad, but they were amazing for me to read around age 12 as an introduction to science fiction.