Eye of Desire Book 1: The ANGUS Revelations by Connie K. Thompson

Artie Bevaqua's sister has lost her soul--literally--and Artie must enlist the aid of her own ancient and schizophrenic soul, Angus to recover it. When the search attracts a sexy veterinarian, a large pharmaceutical company, too many men with guns, and peculiar bounty hunters, Artie must evolve into more than she's ever been to save her loved ones. But even if her body survives, will her heart?