When a hero emerges from the wreckage of an explosion in Indianapolis, the BAU team members must protect him, as they try to identify the person responsible before more bombings occur.
Sheldon gets a summer job at the local train museum; Missy embarks on a new stage of womanhood; Georgie discovers Mary's guilty pleasure.
Alison deals with her mother's death; Hanna and Aria attempt to tie up loose ends with Ezra and Mona, who know the truth about Alison's story; Spencer and Emily probe Jason's past whereabouts.
When J.J.'s attempts to make a good impression on Izzy's parents fail, he changes course to make a bad one instead; Maya is jealous when Melanie is the recipient of a public display of mom-love; Kenneth leans on Jimmy for support.