Quick recap
Sam Lawton is on a bus with his coworkers headed to a corporate retreat when he sees the North Bay Bridge collapse. He pulls his ex-girlfriend Molly, his best friend Peter and a few others off the bus, and the bridge falls. William Bludworth tells them there's a way out: kill someone and take the years that person had left. The idea poisons the group. Peter, unraveling after losing his girlfriend Candice, tries to kill Molly, and Sam kills him. Sam and Molly board a plane to Paris. It's Flight 180, in 2000. The plane explodes with both of them on board, closing the loop with the start of the series.
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