On the trail of the Frozen Hearts Killer, Nancy and herfriends follow a surprising lead from a podcaster at an annualconvention for amateur sleuths - where they also findthemselves unraveling ghostly clues about a homicide from the1950s.
Jamie faces backlash from fellow officers, when he partnerswith Erin and Anthony to investigate an underground bar theNYPD and FDNY use to hide their criminal indiscretions. Also,Eddie's partner, Witten, considers leaving the force; Dannyand Baez investigate a student's murder at a prestigiousprivate school; and Frank addresses an issue of policebrutality regarding Baker's husband.
As the team races to stop a violent band of armed robbers, thesearch is complicated by civilians using a public safety appthat encourages vigilantism. Also, Street receives difficultnews that alters his future.
Diane returns to help with Crisis One intervention training forStation 19 and Station 23 firefighters. Meanwhile, Andy andSullivan continue to be at odds, and Jack helps a youngautistic man on a city bus.
Hope has to relinquish control and allow Josie and the SuperSquad to enact a risky plan that could save Landon. Landon andCleo meet in Malivore's darkness and learn more about oneanother. Meanwhile, Lizzie, Kaleb and Ethan volunteertogether, and all does not go according to plan.