I am going through Andreescu et al.,Problems in Real Analysis: Advanced Calculus on the Real Axis and I am very impressed: the style of the book seems really modern and the material covered includes many theorems, examples, etc. that are rarely or not at all seen in other books (both theory books and problem books) and that are often taken from not well-known sources or from recent issues of math journals.
I was wondering if there is a "theory book" that resembles the one I mentioned (and roughly covers the same material)?