The dog food caper
Joan Lexau
When his neighbor finds dog food in strange places all over his house, Willy Nilly asks Miss Happ, a witch, to help solve the mystery.

by Marilyn Singer (1986)
Philip Barlowe, bumbling detective, and Sam Spayed, his intelligent dog, are hired to investigate the will of a woman who has left her vast wealth to her cat.
Joan Lexau
When his neighbor finds dog food in strange places all over his house, Willy Nilly asks Miss Happ, a witch, to help solve the mystery.
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.
Gloria Skurzynski and Alane Ferguson
While visiting the Everglades National Park with their parents, the Landon children uncover the mystery of dying manatees and learn important lessons about the natural environment.
Linda Lee Maifair
When snacks and candies disappear from the shelves at Remington's Grocery Store, detective D.J. Doyle takes on the case and makes a new friend in the process.