Apparently, no one is off-limits in "Blue Bloods" because a serial killer returns from Danny's past, and now he has a threat looming over his family. This will of course ruffle the feathers at home, a little more than usual.

Episode 8, titled "Unsung Heroes," will air on broadcast network CBS this Friday, Nov. 13 at 10 p.m. EST, according to TV Guide.

This episode brings back Thomas Wilder (guest star Louis Cancelmi) in the same role as a serial killer that has evaded capture by Danny very well thus far. But his return is not specifically on Danny himself, but rather on his family, according to Spoilers Guide.

With all of the family issues that has been going on lately with the Reagans, this will add another twist in to the depth of turmoil they will be forced to endure.

Linda becomes more concerned about Danny's job with this ordeal and she is starting to see it as to big of a threat to her family. The state of their marriage is already shaky at best, but this could be the end of her rope, with just enough weight to push them even further apart.

Also in the episode, Jamie will find himself standing up to one of his superiors and challenging his authority during a hostage situation. Of course, the fact the he is a Reagan could give him more mojo for the situation, but the incident will not go down lightly, and sometimes it is best not to make enemies in higher positions.

The family recently got into a wedge when Erin was forced to go after Frank's own officers to weed out the ticket fixing that has been running rampant in the NYPD. This drove a wedge between the father and daughter and they are still at odds.

Check out the preview below.