For the past 20 years, Kevin Whately has played television detective Robbie Lewis, who was Inspector Morse's right-hand man. In this heart wrenching documentary the actor investigates a subject close to his heart - dementia. Kevin's mother Mary, who is now 83, was diagnosed with the most common form of dementia, Alzheimer's disease, eight years ago.  Tonight, he takes a look at the different, often misdiagnosed disease, and the many disparities in what certain doctors, and professors think can aid, or cure it. The programme also looks at whether people with Alzheimer’s should have access to a wider selection of drugs despite the financial implications and it reports on alternative therapies including Nintendo Wii therapy - which is a marketing angle Nintendo really haven't explored thoroughly enough.