It's all neurochemistry

Even if you're dead, for few hours even, the neurological data is still accessible, so taking the biological brain and imprinting it into a synthetic one, they can replicate the human mind. You're good as new, probably host a new body, but cloned to perfection still. Sounds easy and simple. But the question is should the dead remain dead. Keanu Reeves is a scientist William Foster who violates every natural law on earth, and beyond, when his family is stricken with a terrible tragedy. The whole thing was doomed to begin with, but if you forget all the foolishness, it's pretty entertaining. Or better yet, because of the foolishness, it's entertaining. Can't tell. Does not matter.