Doug thought that moving in with his sister Isabel was a sensible thing to do after his wife had died of cancer. It seemed better than both of them living alone. Little did he know that his life was to change dramatically when he was caught up in the exploits of Isabel's co-worker, the brilliant scientist Vincente Da Cosa, an expert in the field of artificial intelligence.

Secrets tells the story of what happened when Doug and Isabel and their friends, Burt, Colin and Les, become entangled in Da Cosa's web of deceit.