Lindstrom’s Progress (Trilogy #2) by John Moss

Intrigued by the unlikely invitation from a detective in Vienna to prove she murdered her lover, Harry Lindstrom finds himself in a strained alliance with a woman who seems to have stepped out of a painting by Klimt. His chaotic pursuit to unravel her story leads him home to Toronto, then back to Vienna, Salzburg, and salt mines near the ancient village of Hallstadtt, where stories from the past and present merge with horrific finality. Lindstrom's Progress is the second in a trilogy, between Lindstrom Alone and Lindstrom Unbound.