Two words, and both of them loaded. Mum is about the most domestic noun in British English; unmasking is what you do when a performance has gone on too long. Unmasking Mum sets them side by side and lets the tension sit there unexplained, which is a confident thing for a memoir to do on its cover.
Lisa Lloyd reaches our catalogue with the recording shelved three ways at once: biographies and memoirs, health and wellbeing, personal development. That combination is telling. It describes the sort of first-person account written not only to be read as a life but to be useful to somebody who recognises their own situation inside it, and that is a harder balance to strike than either mode on its own.