Mu (cat)

µ is a female cat who once belonged to the mathematicians Archimedes and Pythagoras Vavasor. Following their deaths, she was looked after by their erstwhile housekeeper Mrs Standage. She is black with white socks and is of mixed heritage. Despite her small size, she is feisty and assertive and does not recognise any superior authority.

Spoiler for THE TRUTH ABOUT ARCHIE AND PYE

Following the fatal poisoning of Mrs Standage, µ was taken in by Tom, |Dorothy and Ali.

Spoiler for A QUESTION OF TRUST

After further consideration, Tom and Dorothy decided it was probably best to avoid any situation arising where Ali might be left in sole charge of µ, so she was relocated to the care of Tom's father.