Dr Proctor is an ageing inventor just waiting for his big break. And when he teams up with his next-door neighbour Lise and her peculiar friend Nilli in making the world's most powerful fart powder, it seems his dream may be coming true.

But the ruthless twins Truls and Trym Thrane are lurking in the background just waiting to spoil their plans.

The drama that follows has repercussions that stretch beyond the imagination, inolving a wild chase through the sewer system of Oslo, anacondas and NASA.

Full of humour and witty dialogue, Jo Nesbo creates wonderfully weird characters and lets his imagination run wild in this delightful children's book debut, reminiscent of Roald Dahl.