The mystery of the zoo camp
Elspeth Campbell Murphy
A special day camp lets three cousins get a look at what happens behind the scenes at the zoo, which helps them solve a mystery involving an escaping pet snake and a missing diamond ring.

by Elspeth Campbell Murphy (1988)
Three cousins endeavor to find out who gave a painting entitled "Sabbath Day" to their grandfather for a birthday present.
Elspeth Campbell Murphy
A special day camp lets three cousins get a look at what happens behind the scenes at the zoo, which helps them solve a mystery involving an escaping pet snake and a missing diamond ring.
Elspeth Campbell Murphy
The three cousins are stuck babysitting their bratty third-cousin Patience and when she disappears while they are visiting an old mansion, they must investigate.
Jan G. Johnson
While spending summer vacation with their grandparents on Orcas Island, Washington, fifteen-year-old Julian and his twin sister try to discover who is behind some unusual petty thefts.
Eloise Jarvis McGraw
Searching for a treasure their great-grandfather left in a "money room" on his farm in Oregon, two children realize that someone else is also searching.