The Mystery of the Seawas Bram Stoker's seventh novel. The novel is an adventure romance with supernatural elements. It was first published in the US in 1902 by Doubleday, Page & Co., New York. The book itself is a 489 page hardcover with an olive green cloth cover stamped on the spine and front panel in dark green and gold. The Mystery of the Sea was first published in the UK in 1902 by William Heinemann, London. This edition is a 498 page (plus 32 pages of advertisements) hardcover with a dark green cloth cover stamped on the spine and front panel in gold and light green. In the same year, this book was also published by Heinemann as a part of their Heinemann's Colonial Library series (No. 243). This edition is a 498 page hardcover with a decorated cloth cover .
First edition book cover
Doubleday, Page & Co., New York, 1902
The Mystery of the Sea was published as a serial in at least one US newspaper. It appeared in as an illustrated multi-page daily serial in four issues of The Denver Post, Denver, Colorado, with the first installment appearing on April 10, 1904 and the last on April 13, 1904.
Chapters I and II of The Mystery of the Sea have also been published as a short story under the name "The Seer." In 1982 it appeared in the short story collections Shades of Dracula: The Uncollected Stories of Bram Stoker, William Kimber, London. The editor of this book claimed that this story was published in the November 1901 issue of The London Magazine, The Amalgamated Press Ltd., London. However, a careful search has shown that no such story appeared in that magazine.
After the publication of The Mystery of the Sea, Stoker wrote a play based on the novel under the title The Mystery of the Sea. A Drama, in a Prologue and Five Acts. However, the play was never performed in front of an audience.
The novel is available as a: The novel can be purchased online as a: Early publication notice
Daily Mail, London, October 7, 1902
 Dalby, Richard and William Hughes. Bram Stoker: A bibliography, Essex: Desert Island Books, 2004, p62.