One or other of them seemed determined to keep his identity secret.

He also strives to keep her identity secret from the world.

Using these methods Richie was able to keep his identity secret for 18 months.

They keep Sach's identity secret, and become friends with them.

Efforts were made to keep the aircraft's identity secret, and it was only flown in the early morning.

Wondering who the man behind the lights was, and why he wanted to keep his identity secret, seemed just as useless.

For many years he tried to keep his address and his identity secret.

Most of the time, a letterboxer in England would keep his identity secret.

Even when such callers identify themselves to social workers, the state is required to keep their identities secret.

The judge has promised to keep their identities secret.