Hardcastle's Secret Agent (A Hardcastle & Marriott historical mystery, 16)
| Country | USA |
| Brand | Musiclily |
| Manufacturer | Musiclily |
| Binding | Electronics |
| ItemPartNumber | MX2249BP |
| Model | MX2249BP |
| Color | 4Ply Black Pearl |
| Size | Squier Mustang HH style |
| UPCs | 194296013445 |
| EANs | 0194296013445 |
| ReleaseDate | 0000-00-00 |