Clementine is a mouse, born in a laboratory with her brothers and sisters, genetically altered to be super intelligent. One day, one of the researchers ‘rescues’ her and one of her brothers, leaving them to be looked after by an elderly man and his visiting grandson. The two humans have to think of a plan to keep the mice safe and prevent the lab from taking them back.

Written as letters Clementine sends in her head to the laboratory chimpanzee Rosie, the story gathers pace as Clementine realises what her fate might be if she is returned to the lab.

This is a wonderful book; I could not put it down. It is both an exciting adventure and a plea not to use animals in experiments. With echoes of Mrs Frisby and the Rats of Nimh (Robert C O’Brien) and even the Queen’s Gambit (Walter Tevis), the reader follows Clementine with bated breath and learns that while some humans are very bad indeed, others can be kind and good. This is a heart-warming story, filled with humour and love.