A deadly computer virus is sweeping the world, harming both computers and humans.

Is this the work of the 'Hackers Fight Brigade'? Twins Troy and Macy are determined to find out. But as they piece together clues and overcome terrifying obstacles, they start to realise that there may be more to this shadowy group of hackers than first thought.

With banking systems about to crash and nuclear warheads about to be fired, can the twins save the world in time?Virus 21 is part of the Toxic series, published by Ransom Publishing, a specialist publisher for reluctant and struggling readers.

The Toxic books offer exciting, shorter stories (just 48pp each) for readers who may find longer books too daunting, but who still want fast-paced, adventure stories.

Virus 21 is ideal for reluctant readers aged 9-12 with a reading age of 8-11.