Books with title the green turtle mystery

The Aldens are spending spring break on a beach, but they aren't just soaking up the sun. They’re protecting an endangered species! Their job is to mark sea turtle nests so the eggs can be moved to a safe place to hatch, but someone is digging up the eggs without permission. Can the Boxcar Children figure out what’s going on and help save the sea turtles?

To rescue a friend’s pet turtle, Djuna must solve the riddle of a haunted house His new shoeshine box under his arm, boy-sleuth Djuna is looking for customers when he meets a young reporter named Socker Furlong. Socker assigns Djuna and copyboy Ben Franklin to investigate a haunted empty house. Djuna, Ben, and Ben’s pet turtle are having a lot of fun creeping around outside—until the place turns out not to be so abandoned after all. Djuna sees people inside the house, and when he knocks, a young girl answers the door—only to slam it in his face. Djuna and Ben run for help and are halfway down the block when Ben notices that his turtle is missing. To get him back, they will have to crack the mystery of the haunted house, no matter what ghosts may stand in their way. Ellery Queen is one of the world’s finest detectives, but his adventures are nothing compared to the Ellery Queen Jr. Mystery Stories. Join Queen’s apprentice, Djuna, and his trusty Scottie, Champ, on adventures filled with danger, suspense, and thrills. The Green Turtle Mystery is the third book in the Ellery Queen Jr. Mystery Stories, but you may enjoy reading the series in any order.

The Aldens are spending spring break on a beach, but they aren't just soaking up the sun. They're protecting an endangered species! Their job is to mark sea turtle nests so the eggs can be moved to a safe place to hatch, but someone is digging up the eggs without permission. Can the Boxcar Children figure out what's going on and help save the sea turtles?

[Childrens Fiction (Ages 10-12)]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!