
The Sentinel by Blair Sandburg
When Blair's mother Naomi secretly submits her son's Sentinel thesis paper to a publisher, Jim discovers that being famous can be detrimental to your health. While Jim and Blair protect a local union leader named Jack Bartley from attempts on his life, information from Blair's paper is leaked to the press and Ellison is caught in the middle of a media frenzy.
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More from this season

S4 E1
Sentinel Too (2)
Blair, Banks, and Megan may be Jim's only hope of overcoming the superhuman stalemate and returning Cascade to a one sentinel town.

S4 E2
Murder 101
It appears that Brad Ventriss and Suzanne Nadine, two students in Blair's anthropology class, are engaged in some extracurricular activities that aren't listed in any of the college handbooks.

S4 E3
Four Point Shot
Ellison knows that the city is in for trouble when Garrett Kincaid, the leader of the Sunrise Patriots militia group, escapes from prison. While Jim tracks the escaped convict, Captain Banks, Daryl Banks, and Blair Sandburg attend a Cascade Jaguars' basketball game.

S4 E4
Dead End on Blank Street
When Internal Affairs accuses him of stealing money captured in local drug busts, Ellison finds that during this case he's forced to answer the hard questions instead of asking them.