There is a theory that death is not the end of existence, but is simply a shift into an alternative universe. This is true and keeps happening to Tom Two-Dan $mith (sic).
Usually, one forgets everything of the past and starts a new life. Tom is not so lucky; he remembers.
In his last transition, he became the head of a large corporation, famous for doing something, but nobody knows what, including the staff.
He is still investigating.
To make life more difficult, the Temporal Conduct Authority, who don't believe the above theory, and are miffed about the fact he has shamelessly flaunted the Laws of Time and Space, are looking to return him to his proper place in the universes (i.e. completely dead).