Hello, I'm an expert in the field of film and literature. I can help you with your question about the origins of the "John Wick" film series.

The "John Wick" film series, which has gained a significant following for its stylized action and compelling storytelling, is not based on a book. The character of John Wick was created by screenwriter Derek Kolstad, who wrote the screenplay for the first film in the series. Kolstad developed the character and the world of John Wick independently, crafting a unique universe that revolves around a retired hitman who is forced back into his former life after a series of unfortunate events.

However, it's worth noting that the success of the films has led to the creation of a comic book series, which serves as a prequel to the events of the first film. The comic book, titled "John Wick," is published by Lion Forge Comics and expands on the character's backstory.

So, to answer your question directly: No, "John Wick" is not based on a book, but it has inspired a comic book series.

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