While investigating Lester’s mysterious "accidental" death, the clues lure Charles, Oliver, and Mabel out of Manhattan — and straight into some dangerous new "old" territory.

A look back at Lester's early days at the Arconia reveals how a young dreamer became a steadfast doorman — sacrificing his future to protect the residents from the building’s secrets.

The trio stumbles upon a crucial piece of evidence... and promptly compromises it. With time running out, they scramble to solve the mystery before the police close in on them.

Snooping goes sideways when three billionaire suspects catch the trio and invite themselves over for an evening at Oliver's.

Thwarted in their investigative podcast plans, Mabel and Oliver look for help from the Arconia support staff — as Charles dines with another suspect and gets caught up in "catching" more than he bargained for.

The investigation takes Oliver and Loretta back to the streets of his childhood, where buried memories surface and secrets about Lester and Nicky's widows emerge. Mabel and Charles follow leads after a break-in.

The mayor warns the trio about the billionaires, sending them to investigate further at a villainous lair upstate — as Oliver boots it in an attempted escape.

Mabel gathers a ragtag group to crash an exclusive ladies night. While trying to save the Arconia from being sold, Charles and Oliver accidentally end up in couples' therapy.

Told through the lens of one annoying robot who may hold the keys to more secrets than anyone realized — the Arconia throws one last party as the residents discover that a killer may still be in their building.

With the clock ticking, the trio doubles down to bring "new" and "old" forces together to bring down a killer — ending in one explosive showdown and the reveals they've been chasing all season.