Roberto Gonzales is in desperate need of The Ghost Detectives’ help. Someone has been letting his horses out at night, even though he’s been carefully guarding them. Suddenly the gate is flung open and the horses gallop away. Without there seemingly being anyone around! This has happened a number of times now, but only when it’s foggy. What does this ghost want? And why do the horses always run for the waterfall? Elsa and Carl have a new thrilling and mysterious case to solve!

The Ghost Detectives and the Case of the Perilous Fog is the third stand-alone installment in Kristina Ohlsson’s spine-tingling, humorous and clever series for the younger readers. Moa Wallin is the illustrator behind the vibrant and atmospheric images.