Operation Underpants

"In the end, it's not the years in your life that count. It's the life in your years." - Abraham Lincoln.

Unceremoniously dumped in a retirement home by their children, international spies Max and Olivia languish forgotten and waiting to die. After finding a secret message in the newspaper, they return to the world of espionage. Escaping from the home, they travel to the UK with the fate of London and much of the world hanging in the balance.

There are six books in the Max and Olivia series, ...