Trama

An actor is killed on set. Hope returns. Jane makes a decision about Casey.

An actor is shot & killed by a prop gun. Dr Hope Martin returns and hopes to reconcile with Dr. Isles. Jane makes an unannounced visit to see Casey before his surgery. A substandard building collapses, trapping team members in a parking garage.—Blair

Tommy is babysitting, so to give them a lift home, Frost first takes him along on a presumed routine visit to a rich developer accused of using substandard building materials, but while he calls his lawyer to 'stop the harassment', the subterranean parking collapses on them. Jane abandons a touching visit from Casey, who insists on taking the terribly risky surgery that may render him paraplegic rather then remain incapable of making love. Maura finally expresses her anger at biological mother Dr. Hope Martin but agrees to donate a kidney for grossly ingrate half-sister Cailin anonymously.—KGF Vissers

A woman comes home from work and confronts her husband for having an affair. She pulls a gun out of her purse and shoots him dead. Then we pan back and see it's a play in rehearsals. The director calls for another round but the actor playing the victim doesn't get up.

Meanwhile at Maura's house, Jane busts her for shopping too much online. Maura tries to focus Jane on going over the risky surgery Casey is planning to undergo. Jane guesses that Maura is upset because she heard from Hope, her biologocial mother.

Tommy comes over with TJ, with Angela close behind. The women get called to the scene.

In the theater, the early impression is that it was an accident with a prop gun. Councilman Roger Deluth's wife Claire is the director.

Jennifer Johnson is the actress who pulled the trigger. The victim was in charge of the prop gun and maintenance on the theater building. Maura is surprised at the look of the bullet wounds.

In the morgue, Maura finds ball bearings in the victim's heart. Ryan either arranged to kill himself or someone else loaded ball bearings in the gun.

Upstairs, Frost says Jennifer and Ryan were dating. He sent her a recent text saying he's on a mission to get over her. She's hospitalized for shock.

Korsak and Jane talk to Jennifer, who says she didn't want to do the scene with the gun. But she has broken knuckles from a fall and couldn't have loaded the gun. She says they were getting married. He proposed last night. She broke up with him because he was always complaining about his job maintaining the theater building, the Storrow Center. She got tired of the complaints. He said he had to figure something out first, but didn't say what.

Hope drops by the café and talks to Angela. She mentions Maura has been ignoring her. Her other daughter Kaylen is doing well, but still needs Maura's kidney. Angela understands Maura wanting to save Kaylen.

Down in the morgue, Jane finds a chunk of concrete, broken light bulb and bent anchor bolt in Ryan's tool box and a note that says: "creep", epoxy, recycled. He had building plans, too.

Maura gets a text from Angela that Hope is in the café. She wants to ignore her, but Hope waits for her outside her office. Maura reminds Hope that she said that conceiving her was the biggest mistake of her life. Hope tries to apologize, but Maura reminds Hope of her reaction that Maura was her daughter: she accused Maura of lying and asked what she wanted from her. And now she's back for Maura's kidney.

Maura knows she should agree, but says Hope has no right to ask her. She tells her to leave.

Upstairs, Jane tries to reach Casey but can't. Frost comes in with a chunk of concrete from Ryan's glove box, which matches a dent in his trunk. His insurance claim said it happened when the chunk fell from the garage ceiling, even though the Storrow Center is only eight months old. The billion dollar center was built by developer Sam Nelson. It includes three buildings with office and retail space.

He has contracts for four more city buildings. They wonder if Ryan annoyed him by noticing problems with the buildings. Frost wants to go snoop on the buildings and agrees to give Tommy a ride and TJ a ride home.

Maura summons Jane to the morgue. Maura feels bad for telling Hope what she really thought. Jane distracts her by asking about ball bearings. Maura thinks they came from a computer hard drive.

Maura urges Jane to go find Casey and convince him not to go through with the super risky surgery.

Frost pulls into the parking garage at the Storrew Center and goes to look around, leaving Tommy and TJ in the car.

Jane drops by Casey's apartment, where she finds him surrounded by pill bottles. He's planning to go through with the surgery, which he knows is risky and could leave him a full paraplegic. He tells her he has no feeling below his waist.

Frost takes pictures of water leaking down the walls of the garage. Sam Nelson catches him and tells him to leave, even though it's public property. Tommy gets out of the car to see their confrontation, leaving TJ in his baby seat. Suddenly a chunk of concrete falls and the garage starts to shake. It collapses, with a giant piece hitting Frost's car. With rubble everywhere, we see only a bloody foot sticking out of the debris.

Frankie calls Jane and she rushes off. When Casey offers to go, she says she can't wait for him.

Down at the Storrow Center, the rescuers aren't planning to attempt to get in to the part that collapsed on Frost and Tommy because it's too unstable.

Maura's already working triage. She tells Jane the results came in on the concrete Ryan had: it's recycled and not as durable. They're worried the whole building will collapse, and Frankie tells Jane it's too risky to go in for them.

In the rubble, Tommy tries to dig his way through. He hears TJ crying in the car but can't get to him. Frost pushes rubble off him. Tommy has a head wound and passes out. Frost's arm is pinned.

Jane tells the fire dept and Councilman Deluth about the recycled concrete, but Deluth says that wouldn't have caused the collapse.

The fire department won't let Jane or Frankie go in because it's so unstable. There are already several casualties. FEMA put a call out to all off-duty doctors and nurses, so Hope shows up to help.

Jane calls Korsak to look up the garage security footage. He sees Frost talking to Sam Nelson and then the collapse. She watches as the building above starts to crumble.

Talking to Korsak, he says Ryan marked something about the P3 floor, the lowest level of the garage. Maura reports that the ball bearings were from recalled city computers that were given to council members. Korsak finds the owners of the concrete company was Claire Deluth, the director and wife of the councilman.

Frankie and Jane confront Roger and accuse Claire of loading the prop gun. Claire confesses, crying, saying they underbid the contracts and took shortcuts, but that they didn't know the collapse would happen. They arrest them.

Korsak calls: there's an abandoned subway tunnel under P3 that was supposed to be filled, but wasn't. Maura and Jane find it and try to get to Tommy and Frost, who are still pinned in the rubble.

Maura finds their heat signatures through the ceiling and they call for rescuers who cut through.

They are able to reach TJ, who is fine. Angela holds onto him outside. Jane runs to Frost as he comes out with a broken arm. Tommy is wheeled out on a gurney, but he's conscious as they take him to the hospital.

Maura tells Hope she wants to hope Kaylen, even though she said she didn't want any part of Maura living in her. Maura doesn't want Kaylen to ever know the kidney came from her. Hope hugs her and thanks her.

Jane looks around and sees Casey standing there in his fatigues. She apologizes for saying she couldn't wait for him. He still wants to go through with the surgery. "I'll be OK, or I won't, it's my choice," he says.

Maura checks in with Jane. Just another day at the office.