Contrive a faked rescue of Johnson.

The jailer can be found trussed up and gagged, to-morrow about midnight.

Best have only one of the Pooles in it; take Amos.

He shall wear a mask and be the bold rescuer; he shall open the cell door, whisper 'Mitchell' to Johnson, and help him escape.

Once out, without taking off his mask, Amos can hide Johnson somewhere.