An esteemed architect known for directing the World’s Columbian Exposition in Chicago, pivotal in the planning and execution of the fair's grand structures.

Burnham’s architectural partner, recognized for his innovative design influence, who played a significant role in their firm's success until his early death.

A renowned landscape architect tasked with designing the fairgrounds, known for his prior work on New York's Central Park.

H. H. Holmes’s assistant and carpenter, embroiled in Holmes’s fraudulent schemes and suffering a tragic fate.

A machinist employed by Holmes, who helped prepare corpses as skeletons for medical use.

The caretaker at Holmes’ building, who was implicated in aiding Holmes with his criminal activities.

Holmes's first wife, married to him before his descent into crime, with whom he had a daughter.

Holmes's second wife, whose relationship with Holmes became strained due to his infidelities.

Myrta Belknap’s great uncle, who was nearly a victim of Holmes while also being a financial target.

The third wife of Holmes, a wealthy woman misled by Holmes and ultimately swindled and murdered.

A storeowner within Holmes’ complex whose family becomes entangled with Holmes's deadly schemes.

Ned Conner’s wife, who becomes romantically involved with Holmes, leading to her untimely demise.

A young stenographer who worked for Holmes, drawn into his deception and eventually disappearing under mysterious circumstances.

An entrepreneur responsible for managing and promoting concessions at the Chicago World's Fair.

The engineer who designed the Ferris Wheel for the fair, aiming to introduce a centerpiece that would surpass the Eiffel Tower.

Burnham’s chief structural engineer for the fair, who resigns after challenges with building calculations.

A celebrated painter and close friend of Burnham, responsible for organizing successful special events at the fair.

The popular and five-time mayor of Chicago, regarded for his lenient policies and tragic assassination during the fair.

The delusional assassin who killed Mayor Harrison, motivated by misguided beliefs of political appointment.