He was tasked with finding Hanna Frey after she disappeared in 1991, but wasn't able to. This haunted him for the next twenty years. When Carter asks him for the file on Hanna, Landry refuses to cooperate, so Reese steals it while he's distracted. After discovering the license plate on Trent Russell's car matches Hanna's abductor with a transposed digit, the two call Landry who helps them interrogate Barbara Russell.