The Pagan's Cup by Fergus Hume — Read

Leo was so surprised by this unexpected sight that for the moment he stood still. Then he made up his mind to interview the pair. Mrs Gabriel and Pratt evidently understood one another, and the two of them together might probably tell him more about himself than one would do. Moreover, Leo was angry at the way in which Pratt had let him lie under the imputation of being a thief when he could have lifted the disgrace from off his shoulders. Certainly Pratt could have done so only at the risk of incriminating himself, but at the time Leo was too much annoyed to think of this. He saw that there was some mystery, and thinking it might have to do with Mrs Gabriel's enmity towards himself, he interrupted what seemed to be a furious conversation by knocking at the window.

Mrs Gabriel and Pratt turned in the direction where the sound came, she with a pale face, and Pratt with a levelled revolver which he took from his breast pocket. Leo might have been in danger of his life, but that he chanced to remember a peculiar tune which Pratt had taught him, in order to announce his coming while he was staying at The Nun's House. At the time Leo had thought this was only a freak of the old man's, but now that he knew who Pratt was, he saw that there was use in it, to Pratt if not to himself. At all events, he began to whistle.