Peter catches sight of a house engulfed in flames. He rushes inside to find a semiconscious woman lying on the floor. She reaches for a stuffed turtle and shouts "dad" as Peter carries her out of the inferno. BOOM! An explosion rocks the neighborhood. Thankfully, Peter and the woman make it to safety.
The woman Peter saved, Jenna Applebee, is in critical condition. The arson investigators, Ray Easton (guest star Tony Serpico) and his young colleague, Skip (guest star Aaron Tveit) won't let Megan take the body until they complete their investigation. The theory is that the dead man is Jenna's estranged husband, Mike. But Megan determines through dental records that whoever she has on her table is definitely not Mike Applebee.
Megan realizes their John Doe suffered a fractured hand and took a blow to the head before dying from carbon monoxide poisoning. She heads over to the fire scene to look for the murder weapon. Ray Easton is still investigating. He likes to be thorough so that he can fire Geraldine, which is the name of a toy cannon he ignites whenever he closes a case. Once again, Megan is made to wait. This guy, Ray, really is playing with fire now!
The team identifies their John Doe as Ben Dupree. He worked with his mom, Louisa Armstrong, at an organization called Families Reconnected. They reunite adopted children with their birth parents. Jenna Applebee was a client. The injury to Ben's hand came when Jenna's birth father, Daniel Robinson, closed a door on it after a visit that did not go well.
The police arrest Mike Applebee, who swears he would never hurt Jenna. Ray Easton also believes this guy is the killer based on his investigation. Peter believes they should be looking at Daniel Robinson. He reveals that Jenna called out "dad" when he rescued her. This case has become very personal for Peter, who lets Megan know that he was adopted. He tossed away an envelope that had info on his birth parents a long time ago.