| title | ISBN-13 | year of publication |
|---|---|---|
| Mystery at Hollowhearth House | 978-0-523-41701-1 | 1982 |
| Phantom of Featherford Falls | 978-0-523-41744-8 | 1982 |
| Secret of Clovercrest Castle | 978-0-523-41741-7 | 1982 |
| SUSAN SAND: EL SECRETO DEL PIRATA DEL MAR | 978-84-272-3228-0 | 1985 |