While autopsying the body, Walter Bishop (John Noble) finds human teeth marks, and that the killer's saliva contains traces of an extinct strain of syphilis.
Boone admits he works for the bioterrorist group ZFT, and will give them everything he knows on the organization if they save his wife Valerie (Trieste Dunn) from them.
Olivia and Peter Bishop (Joshua Jackson) enter the club and manage to find Valerie, with the help of a thermal imaging camera, as her infection causes her to have a raised body heat, and subdue her with tranquilizer guns.
However, beforehand, Boone managed to have pre-recorded a message for Olivia, informing her that ZFT has been funded by Massive Dynamic founder William Bell.
[1] It also earned a 4.0 ratings share among adults aged 18 to 49, representing 5.215 million out of the total viewers, and was the ninth largest audience on American television in that demographic the week it aired.
Annalee Newitz of io9 was positive towards the episode, opining "last night's Fringe made us feel all grody-happy inside," and it is "scoring well on the tightly-plotted-o-meter.
"[5] Ramsey Isler of IGN rated the episode 7.5/10, having enjoyed the interactions between Peter and Walter, and of Olivia and Broyles with divorce, noting "just how creepily observant both of these characters are.
"[6] Sarah Stegall of SFScope thought the writers "gave us some moments of real poignancy," but was disappointed of Olivia's characterization, stating "they need to study that character more closely," and that she "deserves more respect than this.
Club rated the episode a B, stating that although it looked like it was "going to be even more of a freak-of-the-week outing this usual," by the midpoint it became "deeply tied into the show’s larger mythology," but criticised the lack of tie-ins.