Rebirth

All Gavin Lewis wanted was a week to forget his awful summer. When he discovers a resurrected Celt in a museum exhibit, memories of his ex-girlfriend and dead dog become the least of his problems, especially when the powerful necromancer who raised her shows up-ready to kill anyone who gets in the way.
Along with his best friend Topher and sister Amber, Gavin and his new two-thousand-year old charge, who he names Jobi, flee the museum, banding together to search for answers. But it won't be easy helping Jobi navigate a now unfamiliar world. The necromancer wants Jobi for herself. And the woman will stop at nothing until she finds her.
As myths and monsters are brought back to life to hunt them down, Jobi must use her growing magical powers to save herself and her friends. Along the way, a love triangle closes in as quickly as the necromancer trailing them. It's in the face of death that they each learn what they have to live for.