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Billie and Jack find a note hidden under a rock at school. It seems to be written in code! It’s time the two friends put their code-breaking skills to the test.

Billie and the Secret Mystery Club have a new case to solve. Who has put leaves in Lola’s sandwich? It’s a real mystery. Soon everyone suspects Benny, but could they have the wrong kid? It’s up to the SMC to find the real culprit!

Billie and the Secret Mystery Club are investigating their most serious mystery yet. Someone has taken something from the principal's office at school! Who would have done such a terrible thing? And when one of Billie's friends becomes a suspect, will Billie even know who to trust anymore?

Someone has stolen all of the ripe strawberries from Mika's garden! The Secret Mystery Club is determined to work out who it was. Could it have been the gardener? Or was it the neighbours who just made a batch of strawberry jam? Whoever it was, they won't get far – not with the SMC on the case.

Billie and the Secret Mystery Club have been given a very important mystery to solve for the principal at school. A long time ago, a time capsule was hidden in the school somewhere, and it’s up to the SMC to find it!

Candlenut’s famous fragrance houses have fallen victim to a string of robberies, and Batthew's beloved home, Olfactory, is the latest target! When Olfactory's entire collection of perfume recipes are stolen by a mysterious burglar, Batthew and Lavender must follow the strangest of clues and find the recipes before Olfactory's legacy is snuffed out for good. But is there more to this investigation – and indeed, more to the history of Olfactory – than they realise?

It’s a new term at Heverbridge School, and Bloodstone Island is in turmoil – mutant animals are on the loose, jealous classmates want to bring Rosie down, and, even worse, there’s a black hole to deal with. Below the island’s surface, an everlasting star is growing in strength, and it just may end them all. Rosie discovers the northside of the island, home to the alluring Imperium Palace. But is the palace one of scientific genius or deadly menace?

Charley has grown up behind the curtain in London's West End; she has even begun taking a turn on stage. But her dreams of being a performer are shattered when she is sent off to boarding school, a place where the girls are forced to do unpaid work in order to fill the pockets of the owners. When she discovers that her theatre home is in peril, Charley decides to escape, and make a dangerous journey along the coast in order to get back to – and save – all that she loves.

Three thirteen-year-old strangers are connected by one big secret. Nervous Ayrton was stolen from his mum as a baby. He was returned safely, but now Mum won't let him out of her sight. Curious Stanley has a Forbidden Grandmother. His mum won't even talk about her. Homeless Sen has finally found a place to live, but she'll be out on the street if she upsets her secretive landlady. What happens when their paths cross..?

Mackenzie da Luca’s mother is missing – she’s vanished without a trace in the jungles of Panama. Now, 116 days later Mackenzie and her dad are in those same jungles. Her dad is desperate to find out what’s happened to his wife. And Mackenzie is desperate to make sure he doesn’t ...