I would highly recommend Eric Evans' Domain Driven Design as the second Object Oriented book to be read. Most any primer on OO will give you the foundation of ideas but Erick's book makes the knowledge useful and has been repeatedly called OO done right.
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[ 2.3 ms ] story [ 28.6 ms ] threadISBN-13: 978-0321125217 ISBN-10: 0321125215
https://en.m.wikipedia.org/wiki/Scott_Ambler
http://www.ambysoft.com/books/theObjectPrimer.html
Note that is the 3rd edition. I had read an earlier edition. He lists the differences between 2nd and 3rd.
Although it uses Ruby as the instructional language, you don't need to know much Ruby syntax to be able to understand the examples.