Suddenly he remembered that Claude Frollo had a secret key, and decided that the priest must have carried her off.
There must be a secret key word which is known to the senders and the receivers.
I rather expect I'll cotton to this same Injun picture writing letter business, once I get at the secret key of it.
There were people who nursed the ambition of laying hands on the secret key.
The imperial Chinaman was not yet able to understand the secret key of Buddha's thought.
And drawing back he cast out into the far water the secret key.
And those who reach to this side are usually proud, believing they now have the secret key to the attainment of all Knowledge.