Hacker opens with Vicky and the rest of her Year 8 class (including her adopted brother Gib and his annoying friend Chaucy) waiting to take a Maths exam. Inside the exam hall Vicky notices several people cheating, including her friend Maggie. Vicky has a programmable calculator, and writes a programme to work out interior and exterior angles and areas of shapes. Unfortunately since she finishes her exam in 20 minutes instead of two hours, her teacher assumes that she is the hacker that stole the Maths exam. She is given a letter by the head teacher to take home.
However, on returning home, she and Gib discover that something far more serious than cheating at an exam is concerning her parents. Her dad has been accused of transferring one million pounds from the bank where he works to his own account. Vicky and Gib set out to prove his innocence by hacking into the bank; however this puts Vicky in terrible danger from the real thief.
I loved this book. Not only is it a thrilling adventure, but Vicky and Gib's relationship is very believable, as is the ebb and flow of "tween" friendships. Vicky is mixed race, as is her adopted dad, and the detail of her darker skin making her feel as though she doesn't quite belong to the rest of her family rings very true. Identity and ethnicity are not the most important aspects of this book, but it is great to see that the problems needing to be solved in this story. And as children pick up the ideas of "girls' subjects" and "boys' subjects" so early, it is very positive to have a book aimed at 8+ featuring a girl computer programmer! It is unfortunate that the computing aspects of this book have dated, but I would hope that the thriller plotline and believable characters would carry young readers through.