A recovering Owen becomes the prime suspect in the serial arsonist case. Meanwhile, T.K. and Carlos find themselves in a fiery situation and Tommy gets the surprise of her life.
Owen is conflicted when his brother Robert asks him for help; Judd and Grace face a family crisis; as T.K. and Carlos prepare for their wedding day, tragedy strikes.
Grace and Judd fight for their lives in the aftermath of the horrific car accident, as flashbacks show how a childhood tragedy led Judd to meet Grace and how they ultimately fell in love.
Carlos's father tries to recruit him to the Rangers, causing a rift to form between the two. Meanwhile, Judd deals with his feelings surrounding Wyatt's accident.
A bank robbery, an apartment fire and a pregnant woman lost in a parking garage are the seemingly unconnected calls to which the 126 responds. Carlos finds himself working on a case with his Texas Ranger father.
Owen and T.K. travel to New York to say their goodbyes to Gwen but the plane experiences a mechanical failure. T.K. reflects back when Gwyn helped get him into rehab years ago.
Grace and Carlos work together when they suspect a young woman was a victim of a black market organ trafficking ring; Owen's brother Robert comes to visit and meet T.K., but surprises Owen with news that can affect the Strand family.