After thoroughly introducing the concept, the book moves on to a more detailed, technical explanation of CEP, featuring the Rapid event pattern language, reactive event pattern rules, event pattern constraints, and event processing agents. Offers practical advice on building CEP-based solutions that solve real world IS/IT problems. Softcover.
Don't pay full price. Extremely academic overview of event-based systems, taxonomies of kinds of events, design patterns for event-based programming, etc. A few long examples in C# and VB.NET. Emphasizes multi-machine distributed event-processing systems. Worth a skim to remind yourself why events are great for decoupling modules in a system. You can have my copy if you pass it on.