The Winter Chronicles:
Doctor Paul Silverman was a modest man. He had just gotten married to woman of his dreams, and his daughter had just been born. He worked for years on the faster than light project for the International Space Administration, and now the project was complete. The first launch of a probe to the world known as Gliese 581g was ready to proceed.
The last thing he had expected was to be kidnapped and placed aboard this probe by a malicious organization. One of his closest friends betrayed him.
Things get even stranger when he ends up in 1941, right in the middle of the London Blitz.
It gets complicated when his betrayer shows up there too, with a grim message. He will be recruited to kill Adolph Hitler.
...and that's just in Part 1.