What really happened to Buck?
On 9-1-1 Season 4 Episode 5, Maddie finally revealed the secret that Buck had been hiding for so long.
In one of the most harrowing episodes to date, Buck started to confront the past, but it also put him in danger.
Meanwhile, the 118 raced to save the lives of workers trapped in a five-alarm factory fire.
What did they find when they arrived?
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Paul Dailly is the Associate Editor for TV Fanatic. Follow him on Twitter.