Marta Ferrer, a middle-aged married women with two children who works in Barcelona’s treasury department, and whose life has been changed in the last few months by her fight against breast cancer. But something seems to be different since her last radiotherapy session. Marta senses that the radiation has given her superpowers, as she first discovers she can become invisible, and then is able to do more and more amazing things. But this means she also has to confront all the supervillains, while keeping her new justice-keeping persona a secret. At 54 years old, she decides what name is than Miss Fifty. Ribas pays literary homage to the women suffering or who have suffered from cancer, addressing the struggle they must endure to get well with humour and positivity. The novel is illustrated by María Espejo.