To research this book, I travelled to Delhi, the capital of India, and met several wonderful people who have devoted their lives to working with street children. I'm very grateful to a British charity, Railway Children, who helped organise my visit.

This is what it says on the back of the book:

Grk Smells a Rat

India is the country of curry, chutney, tigers, the Taj Mahal - and the blue rat gang.

In Delhi, hundreds of children have been enslaved. Will no one help them? Does no one care? One person does. And one dog too. On trains and rickshaws, travelling from slums to palaces, Tim and Grk plunge into the heart of India for the most exciting adventure of their lives.

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Reviews

Tim is on holiday in India watching his friend Max Raffifi play in a tennis tournament. Here he discovers a group of boys selling counterfeit copies of books and DVDs, who are controlled by an evil blue rat whose servant is an old woman. While Max is winning his tennis match, Grk sniffs out a bomb beneath the stadium, but will anyone believe Tim when he tells them? This is the fifth Grk book and I think it's the second best in the series – almost as good as Grk and the Pelotti Gang.
Leo Taylor, The Independent

I think this is a brilliant book with great descriptions of India and how each and every character is feeling there.
Molly Armstrong, Red House

This book is a must-have and a book that cannot be put down. You don't know what you're missing out on!
Jasmin Marchant, Red House