Start with why ; how great leaders inspire everyone to take action

Read it in a few days, easy to read, however the concept is really summarised in 1 sentence - find your purpose (or this of your company as a leader) to create trust, emotion ant Ultimately fidelity to your customers. A leader shall be followed, because his purpose is clear and constant - leave the how to others (but don't forget it), and the what shall come from those 2.