As someone new to Amazon Lambda and wanting a 10,000 foot overview of what it is and how it works, this little gem of a book delivered exactly what I wanted to know. It touches on all of the concepts involved, the good, the bad, and how it relates to other AWS services. Only downside is that it could use some updating as a few things have changed since this was published. As far as code examples go, it provides some basic "get up and running" examples, but nothing in-depth, so if you're looking for a code cookbook or lots of practical "heavy lifting" examples this isn't the book for you. The author also does not cover advanced topics such as application architecture, building "multi-project" applications, how Lambda "projects" interoperate or call one another, etc., in any depth. Overall a great basic high level introduction to the technology and how it fits into the AWS ecosystem, but don't expect to start building API-driven web apps when you're finished. You will come away knowing what it is, does, its limitations, etc. though. Overall a great introduction to the technology.