This is a set of 9 Oshiri Tantei (Butt Detective) books! 1. The Purple Lady's Code Case 2. The Giant That Disappears in the Dark Night 3. The Immortal Thief Gang 4. Detective vs. Phantom Thief 5. SOS from the Ruins 6. The Detective Agency in Danger 7. The Mystery of the Observation Tower 8. The Phantom Thief and the Targeted Bride 9. Whose Hands Hold Lucky Cat? These are used books. Please check the photos.