Twinned Universes (Catalyst Chronicles, Book Two) by Sandra Ulbrich Almazan
Series: Catalyst Chronicles, Book 2.
Approx. 93,080 words.
Published on March 3, 2013.
After Paul's mother is killed in his own universe, he learns he's the clone of Sean Lyon, a TwenCen musician. The best way for Paul to unmask the killer is to impersonate Sean. Paul must make his way to Sean while evading time travelers who fear he’ll change the history of the TwenCen universe. If Paul is to achieve justice, he must risk his own life and the wormhole connecting the universes.