The Manager's Path by Camille Fournier This book validated a lot of my fears and concerns. It also gave me much more insight to see how other managers/directors above me see my role - rather than just focusing on your reports.

Also, join Rand's manager slack. http://randsinrepose.com/welcome-to-rands-leadership-slack/

Even if you only have time to lurk on that slack, the discussions have been incredibly illuminating for me!