Someone is trying to destroy David Eliot's school. A year ago, he'd have been happy to see the end of Groosham Grange and its ghoulish teachers. Now, he's on course to win the Unholy Grail, a cup of magical power presented to the star pupil. But a series of suspicious mishaps sees the gap between David and new boy Vincent King narrow alarmingly. Someone, it seems, is trying to stop David winning – and, worse, threatening Groosham Grange itself!

A hilarious new story about the world’s worst detectives, by the bestselling author of the Alex Rider series, Anthony Horowitz.Private investigators Tim and Nick Diamond haven’t had a case for three months and are down to their last cornflake. So when a glamorous woman comes into their office offering them a pile of cash to find her missing father, they think Christmas has come – only it turns out they are the turkeys! Before they know it, they are caught up in a case involving bik...

Twelve-year-old Joe Warden isn’t happy. Sure, he’s rich, but his parents don’t care about him. His grandmother should make everything better, except that Joe’s granny is a nightmare. She’s not just physically repulsive, she’s horribly mean. Everyone thinks she’s just a dotty old woman, but Joe knows the truth. He’s seen behind her mask and glimpsed the wicked glimmer in her eyes – she is pure evil. And now she’s out to get Joe, unless he can stop her and her band of nasty grannies first.

When the Diamond Brothers receive an invitation to a school reunion on a remote Scottish island, things seem to be looking up. But Nick’s got a bad feeling, and it’s not indigestion. And when he meets their fellow guests, the feeling only gets worse – especially when they start dying in ever more bizarre ways!

Thirteen-year-old Nick Diamond is in prison! Framed for a jewel heist, quick-thinking Nick finds himself sharing a cell with public enemy number one: Johnny Powers. Nick’s only chance of clearing his name is to nail the Fence, the country’s master criminal. But to do that, he needs to break out – which is where his bumbling older brother, Tim, comes in. Nick’s not so sure he’ll make it to his fourteenth birthday!

When Stuart Font decides to throw a house-warming party in his new flat, he invites all the people in his building. After some deliberation, he even includes the unpleasant caretaker and his wife. There are a few other genuine friends on the list, but he definitely does not want to include his girlfriend, as that might involve asking her husband. The party will be one everyone remembers. But not for the right reasons. All the occupants of Lichfield House are about to experience a shocking ...

For Tad Spencer, only son of a fabulously wealthy businessman, every day is like Christmas. Until he makes the mistake of wishing he was someone else. The next morning he wakes up as Bob Snarby, trapped in a cruel and squalid funfair world inhabited by hopeless criminals, mysterious fortune tellers and – worst of all – the murderous Finn. But he's there for a reason, as Tad discovers when he begins to untangle a secret that will introduce him to the most unexpected enemy of all ...

Tom Falconer is in trouble. Pursued by the notorious criminal Ratsey, Tom soon finds himself alone and hungry on the streets of London. Luckily enough, the mysterious Dr Mobius soon recruits Tom to play an important role in a play to be performed in front of Queen Elizabeth. Tom knows there’s something not right about Mobius, but he’s willing to take a risk in order to keep his neck out of Ratsey’s murderous hands. Little does Tom realise that Mobius’s dark secret will trap him in the midd...

When the vertically challenged Johnny Naples entrusts Tim Diamond with a package worth over three million pounds, he’s making a big mistake. Tim Diamond is the worst detective in the world. Next day, Johnny’s dead, Tim feels the heat, and his smart younger brother, Nick, gets the package – and every crook in town on his back!

Thirteen-year-old David Eliot was a disappointment to his parents. But to be sent to Groosham Grange? Hidden away on a lonely island, Groosham Grange is a school that is unknown to the outside world. Pupils are forced to sign their names in blood. An English teacher is held together entirely with bandages. A soccer ball is made of ... well, you'd rather not know. What is the chilling secret hidden behind the headmaster's door? And why are students disappearing in the middle of the night? S...

The man in the photo is so blurry it's impossible to make out what he really looks like. And that was before he was run over by a steamroller! His name was Lenny Smile and he ran a children's charity called Dream Time, financed by millionaire author Joe Carter. Now Carter wants to know just what happened to Smile – and to the money. Unfortunately for him, he's hired the Diamond Brothers – Tim, the world's worst private detective, and his wise-cracking younger brother Nick – to solve the my...

It looks like Tim, the world’s worst private detective, and Nick, his brainy kid brother, are in trouble again. They’re dead broke. But money is the least of their worries when a mysterious man bursts into their office and offers Tim a wad of cash for his coat. Minutes later, the stranger is dead and Nick and Tim are left to puzzle over his final words. What could he have meant by "suff bee suff-iss"? Or was it "south by southeast"? Neither one seems to make much sense, but the Diamond bro...