The Forbidden Trail (Melody Lane Mystery #2). Lilian Garis. Grosset & Dunlap, 1933. First ed

The Forbidden Trail (Melody Lane Mystery #2). Lilian Garis. Grosset & Dunlap, 1933. First edition. Original dust jacket.

Carol observes several foreigners in town and that at least one of them seems to be trying to communicate with Veronica. Meanwhile, Carol learns that Veronica has inherited the cave on the Forbidden Trail from her father, who is missing and presumed dead. Veronica’s father had said that the cave held the secret to a great scientific discovery. When Carol receives a warning message not to interfere in Veronica’s affairs, she knows that something sinister is afoot. Carol does not understand what is going on, but she knows that the answer to the riddle lies in the cave on the Forbidden Trail.