Night Walker — Donald Hamilton

When Navy Lieutenant David Young came to in a hospital bed, his face was covered with bandages and the nurses were calling him by a stranger's name. But David's nightmare was only beginning. Because the man they believed him to be was suspected of treason--and had driven his wife to murder.

Now David's got to make his way through a shadow world of suspicion and deception, of dirty deals and brutal crimes, and he needs to stay one step ahead of enemies whose identity he doesn't even know--since if he can't, his impersonation of a dead man is about to become a lot more realistic...