When all traces of his existence are erased, and his wife and child with a man claiming to be him, a reporter must find out how and why he was deleted to recover his life and family.

In a modern world where one's identity, especially online, is currency losing it could spell disaster.? However, the basic concept would need far too much exposition far too early on for the stakes to be clear. What if his daughter, son, wife or all forget his very existence? This would make the stakes personal and motivate him to NEED to rectify the situation.

I think getting one's life back is no big deal, but getting one's family back is, perhaps make that his goal.
For example:
After he is erased from his wife and kids' memory, and anyone else who ever knew him, a journalist must find a way to restore their memories in order to get his family back.

Possible title: Invisible

"When all traces of his life are erased, a tenacious reporter must discover the who, what, where and why in order to get his life back."