Vigilance - The Unbound, #4

For the first time in weeks, I felt normal. Despite the soldiers at our school, despite the creature chasing us halfway across Europe, things seemed like they could be all right again. And then I collapsed, the bond giving me my powers nearly breaking. If not for my girlfriend Karen's help, I would have lost the connection, and I would have died. But our friend Shannon was already weakened when it happened, and now she's dying.
The only way to safe her is an ancient artifact built by a mad Roman, stored deep underground in an unknown location. We know how to find it, but others do, too. Others that may not be friendly.