I can't say I really found use out of the book I'm about to mention, but Michael Bordt writes a lot of philosophy/self-help books in a concise German style. For

I can't say I really found use out of the book I'm about to mention, but Michael Bordt writes a lot of philosophy/self-help books in a concise German style. For example, "Die Kunst, die Eltern zu enttäuschen: Vom Mut zum selbstbestimmten Leben."