What happens when Marion loses her class pet hamster and a mysterious letter turns up in her locker in this sixteenth book of The Critter Club series? Finally!

"This is the most fun I've had with a book this year. Every page is a delight and the mystery got its hooks into me from the first chapter.” – Stuart Turton

In 1997, when demolishing an old house in Amsterdam, two bundles of letters were found. They were written by a teenager who had been sent by the Nazis to a labo

When a broken ankle forces Marion to withdraw from the horse show, she finds a way to stay active by helping her friends at the Critter Club animal shelter find

"What a delight... I found myself so drawn into this world of peculiar crimes that finishing the last page left me disoriented, requiring an extra beat to flash