Death watch : a novel / by Stona Fitch.

"The glimmering case of Death Watch hides a terrible secret--at any moment, seven knives might emerge, ready to kill. By risking death, Death Watch can inspire deeper appreciation of life. But who would create such a dangerous, absurd watch? Who would sell it? Who would strap it to their wrist? Would you?"-- from https://www.arroweditions.com/shop/p/death-watch, accessed 20230522.

"Coe Vessel, son of a legendary adman, lands the much-anticipated ad campaign of artist-provocateur Watanabe's latest creation, a mysterious watch called Cassius Seven. The enigmatic Watanabe claims the watch can kill its wearer. Convinced it's a high-art hoax, Coe and his team of renegade creatives work furiously to land the campaign and persuade the world that the watch (rebranded as Death Watch) is the must-have accessory for end-time capitalism. Thanks to the team's inventive launch, Death Watch finds eager buyers among the brazenly cocky, thoroughly disillusioned, and silently suicidal. Death Watch soon becomes a cultural phenomenon, harbinger of a new nihilism, and a target for moral outrage. Exactly what Watanabe envisioned. But his hoax turns horrific when the watches start going off, killing their wearers. Appalled, Coe and his team reverse course and work feverishly to alert would-be customers. But can they stop the juggernaut they set in motion?"-- from Barnes & Noble.