Sam and Annabel are visiting Drumheller, Alberta, where the farmland Sam’s mother lives on is host to a dinosaur dig. Annabel, an avid learner, is thrilled to have access to paleontologists and spends as much time as she can near the dig, much to Sam’s dismay. But when they learn the dig has uncovered scientifically important bones, even Sam’s interest is piqued. In fact, the whole town is talking about the dig. When Sam and Annabel learn that Humphrey Battleford, a famous collector of stolen goods, is in the area, they are on high alert to keep the ancient bones safe.
Angus and his best buddy, Shahid, share a love of science and their robot, Gordon. But recently, the artistic Ella Eckles has had a peculiar effect on Angus. When a stink bomb at the school provides a chance for him to talk to her, he claims to share her interest in reading facial expressions and declares his ambition to become a crime-solving mentalist. He impresses Ella by identifying the stink bomber, but fails to mention he witnessed a scrawny kid setting off the bomb. When Ella's treasured sketchbook is stolen, she asks Angus to find the thief. Shahid thinks Angus should confess that he's not a mentalist, but Angus is certain he can learn to read people and recover Ella's sketchbook. He asks Shahid to help him investigate the suspects: Gaga Girl; the art teacher, Mr. Wilder; and finally, "scrawny kid." Equipped with rearview sunglasses and an informant who lurks in the washroom, the duo bungles their way through a series of encounters that alarm Shahid and provide Angus with some unfamiliar exercise.
On a visit to a seaside town in Australia, fifteen-year-old Sam meets Annabel, who works at the local museum. Annabel's interest in history is infectious, and Sam soon finds himself eager to hunt for the remains of a boat called the Mahogany Ship—a shipwreck sought after by many. When a storm creates an erosion hole that exposes a structure, Sam and Annabel are convinced it's the fabled ship. Soon all of the museum staff are at the erosion site to check it out. But the same storm also destroys the museum's power; someone knows the alarms aren't working and steals the museum's most treasured artifact, a large porcelain peacock worth $4 million. As Sam and Annabel search for the thief, they realize there may be a link between the fabled shipwreck and the recent theft.
Fifteen-year-old Christine is visiting her eccentric great-aunt in historic Witcombe, where a pickpocket has been victimizing tourists. Aunt Maude owns an antique store and also runs the town’s ghost walk, which gives Christine the opportunity to meet local characters and visitors, including a mysterious young man who seems to know far too much about the crimes. When the pickpocket targets Aunt Maude’s store, Christine is determined to find out who is behind the thefts. Her search takes her through the nooks and crannies of the quaint town full of stories, and she unearths more than one surprise.
Fourteen-year-old Preston Craft is organizing a film festival for his school's film club. When one of the films goes missing two days before the festival begins, Preston is convinced it was stolen and is determined to get it back. The only indication of the theft is a suspicious shadow that Preston noticed right before he discovered the film was gone - but Preston is legally blind and no one quite believes him. However, not unlike the gritty private eyes in the classic black-and-white films he adores, Preston refuses to give up. Can he solve the mystery based on such a shady clue?
Clay would much rather work as a lifeguard at the beach than at Safari Splash, the new water park in town. He's certain the summer will drag along, despite his position at the Boa, the park's fastest slide. The summer job starts to get interesting when he learns that someone has been wandering the park in a lynx costume, scaring the staff. When forty thousand dollars is stolen from the till, and his friends are under suspicion for the theft, boring is starting to look good. But Clay is certain that the mask and the thefts are connected, and he's determined to solve the crime.
Rusty, Katie and Sheila are sent out of town with Rusty's grandparents to keep them out of trouble. This time the trio is in historic Barkerville, a gold rush town with a secret. After witnessing what they take to be a ghost in the night, the three friends find themselves involved in a mystery from the past that seems to have a few other people interested as well. New information has come to light about a fortune in missing gold, a centuries-old curse and a missing miner. While the three budding detectives try and figure out which of the aging prospectors they keep running into is actually a ghost, they find they are in a race against time to recover the gold and return it to its rightful owners to avert a tragedy. Will they find the gold in time? Or will they suffer the fate of Three Finger Evans, the missing miner?