Ransom

When a virus strikes, it's only the beginning.

Stephanie Ross runs a successful computer support business in Bristol, solving other people's problems with calm efficiency. But when a wave of ransomware attacks sweeps through her clients-and then cripples her own network-she finds herself at the centre of something far more dangerous than a routine cyber threat.

As systems fail and data is held hostage, the attacks begin to look less like random infections and more like a coordinated assault. ...