Mac Argeneau knows all too well: immortals can be killed by being set on fire. So when Mac's house bursts into flames, with him inside, he's sure it was no accident. The silver lining is that a female investigator appears on the scene and sparks feelings in him that have been dormant for centuries. For CJ Cummings, the biggest mystery is how this sexy scientist emerged from a blazing inferno without a burn mark on him. He's clearly hiding something.