West of Sundown (West of Sundown #9)

Temptation abounds! Griffin discovers power untold in the hands of Dr. Moreau, while Rosa is offered the blood of Miss Bouncing Betty. It's up to Dooley, Dirck, and Cumberland to come to the rescue... but that might not be so easy, seeing as they're damn near out of their minds wandering the desert on some of that special native tea.