he Green Turtle Mystery (1944)

This eerie mystery thriller features a vanishing girl, a Spanish speaking parrot, and a time-telling turtle. Djuna and Ben weren't sure they believed in ghosts. The little girl who opened the door of the haunted house didn't look like a ghost yet she vanished into thin air. They had to find out what happened to her. And they had to rescue Waterbury, the time telling turtle who walked into the deserted house - and didn't walk out. Djuna found clues and he added them all up to solve a case the Secret Service couldn't crack!

"The house is haunted," the fat stranger tells Djuna and Bill. But the two boys don't scare easily. How they find out for themselves - and what they learn - make frontpage headlines. This eerie mystery thriller features a vanishing girl, a Spanish-speaking parrot, and a time-telling turtle - in a case that baffles even the Secret Service.

The Green Turtle Mystery Translations: 
Dutch: Het Geheim van de Groene Schildpad 
French: Le Mystère de la tortue verte 
German: Milo und die Schildkröte 
Italian: Il Mistero Della Tartaruga Verde 
 Swedish: Duffy och sköldpaddsmysteriet 
Turkish: Yeşil Kaplumbağa 
Japanese: ryokusyoku no kame no himitsu