Deadbeat druid
(Book)

Adam Binder has lost what matters most to him. Having finally learned the true identity of the warlock preying on his family, what was supposed to be a final confrontation with the fiend instead became a trap that sent Adam's beloved Vicente into the realm of the dead, where none living are meant to be. Bound by debt, oath, and love, Adam blazes his own trail into the underworld to get Vicente back, and to end the threat of the warlock once and for all. -- adapted from back cover