As soon as we strike our first chord, I know Hunter’s plan is genius.

The speakers are so loud that every shark in Town Square turns our way.

First, they take off their headphones.

Next, their heads begin to nod. Then their tailfins start to swing. Their fins swish, floosh-floosh-floosh to the beat.

Shoulders jiggle, hips wiggle.

Fins are thrown up over heads, and sharks are jiving and spinning and dancing like I’ve never seen before.

Hugo was right. This really IS our best song ever!

Soon, more sharks arrive, drawn by the music. Hunter turns the volume up even louder, and within seconds the square is packed. I try not to think about the riff as we groove through the song.

‘It’s working!’ Gilleon cries, beaming at the crowd. ‘They’re un-zombiefying!’

‘Uh-oh,’ says Gnash, pointing a drumstick at the horizon. Coming over the rise are four orcas – The Killer Wails.

‘Don’t get distracted,’ shouts Hunter. ‘Keep playing!’

I look around. Gill’s right – it is working. Everyone in the crowd is blinking and rubbing their eyes. The mind control is wearing off!

At that moment The Killer Wails storm into Town Square, barrelling towards us.

‘Louder!’ cries Hunter, turning the speakers up to eleven. ‘Let’s fry their circuits!’

We smash the chorus, and then it’s time. The impossible riff.

I take a deep breath and remember what Hunter said. Impossible for Finley, maybe.

But easy-peasy for a rock star like Felix Frenzy.

And I am Felix Frenzy!

I let my fins take over. Instead of thinking about the riff, I feel the music.

I smash it! My fins move like lightning! Smoke rises from my guitar, but I don’t dare to stop.

The crowd goes wild. I play even faster. It’s easy. It’s fun. It’s not impossible at all!

Blue sparks start to spit from The Killer Wails. Their heads spin like possessed demons, and their jaws fly right off. Finally they collapse on the ground, broken and twitching.

‘WE DID IT!’ cries Hunter as the song hits its final note.

I lower my guitar, a giant grin stretching across my face. I did it! I nailed the riff!

Down in the crowd, sharks clap and cheer. Free from The Killer Wails’ mind control, they hug and high-fin each other.

’JAWSOME save Chumville!’ shouts Gnash. ‘Hooray!’ He pulls us into a group hug.

Suddenly Hunter pulls free, sniffing the water. ‘There’s that smell again,’ she says. ‘Soy chum-a-latte and jellyfish

doughnuts. It can’t be …’

She heads for a patch of seaweed at the edge of the crowd. Reaching in, she pulls out a shark holding a remote control.

We all sail over.

‘Well, well, well,’ Hunter says.

‘Look who we have here!’

The shark with the remote control looks sheepish. My jaw drops. I’d recognise that mullet in a heartbeat. The shark holding the remote control is