confederate

A confederate—and even that one glance had told me how dangerous a man that confederate was—had kept guard while the Professor had attacked me.

“He was able to fix up his own little hiding-place without any confederate—save, of course, that precious housekeeper of his, whom I should lose no time in adding to your bag, Lestrade.”

He may have stolen it from Pietro, he may have been Pietro’s confederate, he may have been the go-between of Pietro and his sister.

There he was dogged by his confederate, who held Beppo responsible for the loss of the pearl, and he stabbed him in the scuffle which followed.”