Peter and Olivia rush into the lab and find Astrid unconscious and bleeding on the floor.  Peter gets a call from the woman saying she found Walter.  Peter rushes to pick up his father.  He tries very hard not to explode when Walter tells him about forgetting the number but can't stop himself from lecturing Walter.  He purposely put his contact information on a piece of paper in Walter's pocket - didn't he remember?  Sadly, Walter admits he didn't.  They thank the lady and leave.

On their way to the car, Peter asks Walter if he remembers which stores he visited.  Of course not, but this list Walter kept.  Store #3 had a good selection of worms, but not as good as his, Walter remembers.  He exaggerated when he said his worms were 4 feet long, really they were only 2.  Peter realizes that the shopkeeper must have ordered his men to follow Astrid after hearing this.  Walter is upset at this news and wants to know what happened to Astrid.

Thanks to a tip from Elizabeth Jarvis, Broyles and Olivia storm the other boat but they are too late; everyone is gone.  Olivia calls Peter with the news but he tells her he already knows.  He is outside Herbalist Shop #3 and the bad guys are there.  He orders Walter to stay in the car while he investigates.

Peter picks the lock to the herbalist shop.  He finds a back room where several people are gagged and tied down to cots.  Across the room, the doctor prepares to cut one of the worm creatures out of a man stomach... while he is conscious.  Peter tries to free the person but is caught.  Two goons hold him steady while the doctor tries to force a larva down his throat.

Fortunately, Olivia and calvary arrive to save the day.  Peter spits out the larva.

They return to the lab.  Astrid is very glad to see Walter; she thought they lost him.  Walter looks shocky.  She tells him not to worry, they can clean up the lab.  Walter is distraught when he gets a look at her beaten face.

At the hospital, Broyles tells Olivia that the survivors are doing well.  Unfortunately, there are at least 6 more immune-deficient patients that were being treated.  And the man they were looking for was a front; he doesn't exist.  It's bad news but Olivia still takes a moment to peek in on Mei Lin and her husband and daughter.

Walter wakes Peter up in the middle of the night.  He's been out of the hospital for a year and wants to get his life back.  But he knows that sometimes he will still get lost.  So, as a compromise, he tells Peter than he as implanted a transponder in his neck so Peter can always find him.