Whose Soul Have I Now is one of the W. W. Denslow/Rand McNally titles that has intrigued me since I first heard of it, simply from its title. As it turns out, it's a fairly obtuse book set in Hawaii and dealing with the suffering and eventual recovery of the wife of a drug-addicted, abusive husband.
However, it does have a very nice cover by Denslow. It's one of his more pictorial efforts, with a wraith-like woman drifting through the trees. It also has an interesting color scheme of lavender, yellow and olive green that is very striking.