Trevor Kay's recent most recent certification book is targeted at those attempting the CompTIA's Security +, described as an increasingly popular entry-level security exam.
As with all books in Mike Meyers' Passport Series, the underlying theme is not depth, but the focus is on what you need to know to past the exam. However, Trevor did organize the book well and you do come away with a good overview of what the info security field is composed off (and hopefully an exam pass!)
There are very few info-sec exams that focus on looking at everything in a wider perspective, identifying, touching on and bringing you up-to-speed with all the many sub info-security fields. That's what Security + is about, an overview, a something to start with, meaning of course entry level.
With that in mind, Trevor Kay's book comes true to its purpose. Covering topics such as:
General Security Concepts: Access Control and Authentication | Attacks, Malicious Code and Social Engineering
Communication Security: Remote Access | Web Security | Wireless Security
Infrastructure Security: Devices and Media Security | Security Topologies and Intrusion Detection | Understanding Security Baselines
Basics of Cryptography: Understating Algorithms | Key Management/ Certificate Lifecycle
Operational/ Organizational Security: Physical Security Issues | Disaster Recovery and Business Continuity | Policy Procedures and Privilege Management | Forensics, Risk Management, Education and Documentation
[+] Well organized
[-] Minor mistakes, some errata