Dark Diamond (Time's Shadow Trilogy 1) by Neal Asher

Captain Blite owns a death-defying device that's coveted by powerful factions across space and time. Dark Diamond is the first in a high-octane new trilogy from sci-fi master Neal Asher, creator of the Polity universe.

Doomed to die. And die again.

Captain Blite knows that someone, or something, is trying to kill him. But a device he possesses, known only as the dark diamond, won't let that happen. After surviving a series of accidents and assassination attempts, Blite comes to realize that whenever he dies the dark diamond reverses time to a moment before his death. He must then go through the traumatic experience again and again until he escapes.

Every deadly encounter Blite survives generates a time flash, revealing potential futures. This attracts the attention of Polity agents and the crab-like p-Prador, determined to manipulate the device for their own purposes. Hunted across space and time, Blite must uncover the true nature of the dark diamond before it causes his destruction...