We have a couple of non-fiction books ready this week. Wendy Mitchell had a busy job with the British National Health Service, raised her two daughters alone, and spent her weekends running and climbing mountains. Then, slowly, a mist settled deep inside the mind she once knew so well, blurring the world around her. She didn’t know it then, but dementia was starting to take hold. In 2014, at age fifty-eight, she was diagnosed with young-onset Alzheimer’s.

In “Somebody I Used to Know: a Memoir” Mitchell shares the heartrending story of her cognitive decline and how she has fought t...