"The Heads of Cerberus" is a science fiction novel written by Francis Stevens and first published in 1919. The story takes place in Philadelphia in the year 2118, where the city is visited by a mysterious stranger who introduces a device that can transport people to parallel worlds.

The protagonist, Mr. Robert Drayton, and his friends, Evelyn and Jack, find themselves trapped in one of these parallel worlds and must navigate through the unfamiliar terrain to find a way back home. The alternate reality they find themselves in is one where the city of Philadelphia is under the control of a totalitarian government, ruled by a mysterious figure known only as "The Head."

As they explore this alternate Philadelphia, they witness the harsh realities of life under the oppressive regime, including the exploitation of the poor and the suppression of free thought and expression. They also encounter various factions within the city, each with their own agenda and motivations.

Throughout their journey, the trio must evade the authorities and avoid detection while trying to find a way back to their own world. Along the way, they make allies and enemies and must use their wits and bravery to survive in this dangerous new world.

Stevens' writing style is imaginative and captivating, painting a vivid picture of the alternate Philadelphia and the characters' experiences within it. She explores themes of power, control, and the consequences of unchecked technological advancement. The novel is a warning of the dangers of allowing technology to control our lives, and the potential consequences of letting power fall into the wrong hands.

"The Heads of Cerberus" remains relevant today, as society continues to grapple with issues of power, control, and the role of technology in our lives. Its imaginative storytelling and exploration of alternate realities make it a classic work of science fiction and a must-read for fans of the genre.

In conclusion, "The Heads of Cerberus" is a masterpiece of science fiction literature that continues to captivate readers over a century after its initial publication. Its relevance to contemporary issues and its imaginative storytelling make it a classic work that should be on every sci-fi fan's reading list. Francis Stevens' legacy as a pioneer of the genre is secured with this novel, which remains a testament to her talent and creativity.