Blurb from the book
The Specialist is a serial killer with very specific and unique tastes. He especially likes the flavor of innocent female bicycle tourists. Kirsten is a jewellery designer whose hobby is caving, and she carries a lot of emotional baggage, above-ground or in the bowels of the earth.
Her sister Emma goes missing en route to visit Kirsten. Then Emma's Kirsten-designed ring mysteriously turns up in a newly discovered cave on Vancouver Island.