Beneath Victorian London, the trains of Grimhollow Station carry passengers who officially do not exist.

Wounded spies. Political fugitives. Classified machines. Soldiers rebuilt with mechanical organs no respectable hospital has ever seen.

Dr. Honoria Vellam has learned not to ask where her patients come from. Her duty is to keep them alive.

Then a soldier awakens on her operating table and tries to kill her.

The terror in his eyes tells Honoria the attack is not his choice.

Hidden inside his mechanical heart, she discovers a device designed to override the body itself—and the name stamped on the machinery leads directly to Crispin Dacre, the brilliant and infuriating engineer responsible for some of Britain's most advanced medical inventions.

Crispin swears the control mechanism is not his.

Honoria does not trust him.

But when another altered patient arrives, followed by another, suspicion becomes something far more dangerous. Someone has taken technology created to restore broken bodies and transformed it into a weapon capable of turning living soldiers into obedient machines.

Their investigation leads into Grimhollow's sealed laboratories, coded railway signals, secret military commissions, and Platform Nine—a platform supposedly abandoned years ago, where a train can still be heard passing through the darkness at 2:17 every morning.

The deeper Honoria and Crispin descend, the harder it becomes to separate their professional rivalry from a growing attraction neither of them can safely ignore.

And then Honoria discovers Crispin's most dangerous secret.

His own heart is partly mechanical.

If the men behind the Lazarus Programme can control the machines inside their soldiers, they may be able to reach his as well.

To stop them, Honoria must trust the technology she fears. Crispin must accept responsibility for what his inventions can become. And before the last signal is transmitted through Grimhollow Station, both must decide whether saving a life means anything if the person who survives no longer owns it.

The Surgeon of Grimhollow Station is the first novel in The Secrets of Grimhollow Station, a Victorian steampunk romance series filled with forbidden technology, gothic mystery, dangerous conspiracies, slow-burning desire, and secrets buried beneath London.