<p>Ness impersonates his future self and makes a terrible discovery.  (Chapter 7)</p>

Stolen Time 07 - Hitching a Ride

Book 2 of the Borrowed Time Chronology

Ness Relevant has traveled through time before. Now he must once again use his time machine to confront a determined foe. Only this time his personal stakes are even higher. Threatened by his future, he must find a way to save his wife and thwart a mad-man's schemes for world conquest, or he'll never regain his stolen time.