Fans of dark, violent, and grisly mysteries (think Chelsea Cain, Val McDermid, Karin Slaughter, etc) may want to read the Jack Caffery/Flea Marley series by Mo Hayder. Reviewers call Hayder "easily today's best writer of visceral and elemental horror" and the books "complex, fast-paced, well written" and "brilliantly plotted." Not for the easily disturbed but exceptionally well written and exciting.