A time-traveling Jack the Ripper is pursued by H. G. Wells.

H.G. and Jane rush to repair the damaged time machine before Dr. John Stevenson - now better known as "The Key Killer" - strikes again. Meanwhile, Vanessa must decide whether or not to confide in Griffin.

After learning that John has taken the Time Machine to 1918 Paris, H.G. is determined to stop him before he can alter the fabric of time.

Vanessa and Jane decide to investigate "Project Utopia," while Vanessa doesn't realize that some of the people in her life are not who they appear to be.

H.G., Jane and John search for Vanessa, while Brooke moves forward with her plan to avenge her father's legacy, ultimately sending H.G. and Jane to a place where they will have to fight to survive.

Wells is shocked to see a familiar face when he and Jane return to present day New York City, while Jane makes a decision that will potentially change both of their lives.

Brooke is betrayed by her brother, Griffin, when he joins forces with Vanessa to stop her from furthering their father's research. But just how far is Brooke willing to go when she forms her own unlikely alliance.