Jack Thomas

The Dutch Vaccine — book cover. A woman in 19th-century dress walks toward a lantern-lit Amsterdam mansion at night.
September 2026

The Dutch Vaccine

Introducing Elsa Hagen

A cure worth killing for

For readers of Frieda McFadden and Karin Slaughter.

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“He poisoned me. And soon he will kill me.”

Netherlands, 1883. A vaccine doctor is dead. His fiancée is missing. She is Elsa Hagen's sister. And the men who killed him have decided Elsa knows too much to live.

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I'm Jack Thomas. I write thrillers that move fast and end badly for the wrong people. The Dutch Vaccine is the first book in the series. Elsa is only just getting started.