In Behavioral Insights. Michael Hallsworth and Elspeth Kirkman give an introduction and overview to behavioural insights, by which they mean the application of evidence about human behaviour to solving practical problems in the real world.
The book includes a history, some theoretical discussion and a discussion of the future of the approach. Most usefully, the middle chapters of the book focus on practical examples and case studies of the approach from a wide range of social problems including finance, public health, environment, and other aspects of public policy.
This is a great introduction to behavioural science for those who are more interested in the practical application of such understanding rather than specific theories of behavioural economics, cognitive biases, and human psychology.