God's War: A New History of the Crusades by Christopher Tyerman is probably what you're looking for. It's a recommended introductory text for Oxford history undergrads who study the crusades, who are not required to have any prior knowledge of the topic. Tyerman's also written the Very Short Introduction to the Crusades as part of the Very Short Introduction series, he's a very engaging writer and very easy to understand, so ideal for a beginner - but he's also at the very top of the field, so you won't find many other introductory books that are as up to date on current debates or as knowledgeable, that are as accessible as those ones.

If you've been through Tyerman and you'd like to expand the comprehensiveness of coverage along a range of avenues, I would recommend the following:

The Crusades through Arab Eyes, by Amin Maalouf. You can find a critical, but not negative, review [here] (http://www.medievalists.net/2015/08/the-rewriting-of-history-in-amin-maaloufs-the-crusades-through-arab-eyes/).

The Metropolitan Museum of Art has an annotated [historical timeline] (https://www.metmuseum.org/toah/hd/crus/hd_crus.htm) with links to medieval works of art related to the Crusades.

Remembering the Crusades and Crusading, edited by Megan Cassidy-Welch, is a very good volume of studies that analyzes the ways in which the Crusades were being remembered--and memories manufactured--already in the Middle Ages.

The Role of Women in the Military Orders, by Helen J. Nicholson (published in Militiae Christi: Handelingen van de Vereniging voor de Studie over de Tempeliers en de Hospitaalridders vzw, year 1 (2010), pp. 210–219.) Written by one of the foremost scholars of the Crusades and the Military Orders, this study can be downloaded from the author's Academia.edu [page] (https://www.academia.edu/5718828/The_role_of_women_in_the_Military_Orders).