3 etsivää ja noitapiiri
| Book | The Mystery of the Magic Circle |
| Publisher | Gummerus |
| Translated by | Annikki Lievonen |
| Copyright Holder | Random House, Inc. |
| Printed by | K. J. Gummerus Osakeyhtiön kirjapaino |
| Series | The Three Investigators |
| Cover Artist | Matti Louhi |
| Format | Hardback |
| Language | Finnish |
| Location | Finland |
| Printed | 1980 |
| Copyright | 1978 |
| Pages / Font | 159 pages |
| ISBN | 951-20-1892-6 |
| YKL (Finnish) | N8453 |
Added by Gumby74