The unit begin a manhunt for a serial killer who jumps trains, targeting individuals living close to the railway.
A political scandal and a severe case of cold feet threaten Kitty and Robert's highly anticipated wedding day. Isaac distracts Nora from her romance with Stan, and Holly gets a surprise visit from an old friend.
There's a trespasser at Fillmore so a new security guard is hired, Snap and Bennigan hold a "Women Empowering Women" workshop, and Adler takes stranger danger too far.
A plaintiff recants a solid accusation, which surprises everyone, while Lucy prompts the revelation of a different surprise.
Natalie believes a critic who panned her daughter's performance is responsible for a murder at the same time as the show.