Books in Louis the Furred series

Louis the Furred is three volumes and each has 35+ black and white illustrations. These books are for children to develop their reading skills. There are no long words to confuse them and they are easy reading. The 2nd and 3rd volumes become more involved and more challenging with mouse and hamster code breaking required- a solvable design is supplied at the start of each book. A fantasy adventure set in London. Led by Louis, five mice embark on discovering the meaning of life. They follow the Sacred Scrolls of Jerboa and are aided by a mysterious ghost. The friends encounter evil hamsters, intelligent rats and a magical substance that works only with imagination. There are three volumes in these adventures, the learning, the mission and the reason. Only through mathematics, physics and luck do they find the answers to their dreams.