[octopus]

Try "A Tour of C++" by Bjarne Stroustroup it has less than 200 pages.

[72deluxe]

Or just get Stroustrup's "The C++ Programming Language" and read the intro bit - it covers the language in fleeting detail but then you still have the rest of the book to look at if you are having a hard time understanding the section at the beginning.

[octopus]

I have both, "The C++ Programming Language" as a physical book and "A Tour of C++" as an ebook. "A Tour of C++" is self contained.