London, 1882: Queen Victoria appoints Harold Spire of the Metropolitan Police to Special Branch Division Omega. Omega is to secretly investigate paranormal and supernatural events and persons. Spire, a skeptic driven to protect the helpless and see justice done, is the perfect man to lead the department, which employs scholars and scientists, assassins and con men, and a traveling circus. Spire's chief researcher is Rose Everhart, who believes fervently that there is more to the world than can be seen by mortal eyes. Their first mission: find the Eterna Compound, which grants immortality. Catastrophe destroyed the hidden laboratory in New York City where Eterna was developed, but the Queen is convinced someone escaped—and has a sample of Eterna. Also searching for Eterna is an American, Clara Templeton, who helped start the project after the assassination of Abraham Lincoln nearly destroyed her nation. Haunted by the ghost of her beloved, she is determined that the Eterna Compound—and the immortality it will convey—will be controlled by the United States, not Great Britain.

Battle is joined as British and American paranormal investigators clash in an exciting gaslamp fantasy. Leanna Renee Hieber's gaslamp fantasy series continues and the action ramps up in Eterna and Omega. In New York City, fearing the dangers of the Eterna Compound—supposedly the key to immortality—Clara Templeton buries information vital to its creation. The ghost of her clandestine lover is desperate to tell her she is wrong, but though she is a clairvoyant, she cannot hear him. In London, Harold Spire plans to send his team of assassins, magicians, mediums, and other rogue talents to New York City, in an attempt to obtain Eterna for Her Royal Majesty, Queen Victoria. He stays behind to help Scotland Yard track down a network of body snatchers and occultists, but he'll miss his second-in-command, Rose Everhart, whose gentle exterior masks a steel spine. Rose's skepticism about the supernatural has been shattered since she joined Spire's Omega Branch. Meeting Clara is like looking into a strange mirror: both women are orphans, each is concealing a paranormal ability, and each has a powerful and attractive guardian who has secrets of his own. The hidden occult power that menaces both England and America continues to grow. Far from being dangerous, Eterna may hold the key to humanity's salvation.

The exciting conclusion to a sumptuous gaslamp fantasy series Leanna Renee Hieber brings Victorian London and New York to life and fills both cities with ghosts and monsters. Two groups of paranormally talented investigators discover that the Eterna compound—thought to be the key to immortality—is, instead, a powerful protective charm. That protection is sorely needed, for both England and the U.S. are under attack by dark forces. Having vanquished the demonic pretender to the British throne, the now-united forces of the Eterna Commission and the Omega Department reach America ready to take on a new menace. But like the United States itself, this evil is rapidly spreading from sea to shining sea. Will the new magic our heroes have discovered be strong enough to defeat it? With its blend of Victorian details, complex plots, and compelling characters, Hieber's fascinating historical fantasy continues to earn critical acclaim and has a dedicated readership.