HarperCollins’ William Morrow imprint has unveiled  a “digital-original mystery, suspense and thriller line” called Witness Impulse. The imprint will release its first digital titles in October, already stocked with 100 books acquired by editors.

William Morrow executive editor Dan Mallory will lead the new line. The launch will include classic Agatha Christie short stories, releasing digital singles of the Hercule Poirot stories and an omnibus edition. Here’s more about the imprint:

Witness will feature the same royalty structure as William Morrow/Avon’s other digital-first imprints: authors receive a 50% royalty once their book sells 10,000 copies (initial royalties start at 25%). They will not receive an advance … Even though these books are digital-first, the HarperCollins sales group is always seeking out opportunities in print, working with key retail accounts to execute tailored promotions in physical stores. To date, more than 60 percent of Impulse titles have a print format, with thousands of printed copies sold for each of those books.

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Dan Mallory will serve as the new executive editor at HarperCollins’ William Morrow imprint, leaving his post as editorial director at Little, Brown UK/Hachette’s Sphere. He will start the new position on October 8th.

Here’s more from the release: Dan has worked with many bestselling and renowned authors including Patricia Cornwell, Val McDermid, Louise Penny, Nicholas Sparks, and Mitch Albom, and launched The Crime Vault, a digital first crime/thriller imprint, and Trapdoor, a dedicated crime-in-translation imprint with Grand Central.

Mallory will acquire and edit books at William Morrow, but he will also launch a crime and thriller digital first line for the publisher.