Quick recap
The story opens with Gotham flooded and Batman presumed dead, then jumps back a few months. Bruce Wayne returns after years away, legally declared dead, and takes on the Red Hood gang in disguise, realizing he isn't ready yet. His uncle Philip Kane wants him to run Wayne Enterprises, while Philip's strategist, Edward Nygma, hires the gang to kill him. Beaten, Bruce recovers, rediscovers the bat cave from his childhood and becomes Batman. He earns Jim Gordon's trust and watches the Riddler cut the power and flood the city. In the end, with Gotham under the Riddler's control and military jets ready to strike, Batman solves the riddles, stops the villain and uses his own pulse to bring the city's power back.

