Good, simple, short book for lay people to get introduced into Reformed Theology?
This would probably be the best book considering the criteria you gave, "What is Reformed Theology: Understanding The Basics"
http://www.amazon.com/What-Reformed-Theology-Understanding-Basics/dp/0801065593/ref=sr_1_1?ie=UTF8&qid=1406165306&sr=8-1&keywords=What+is+reformed+theology
http://www.amazon.com/What-Reformed-Theology-Understanding-Basics/dp/0801065593/ref=sr_1_1?ie=UTF8&qid=1406165306&sr=8-1&keywords=What+is+reformed+theology