The Wooden Hand by Fergus Hume

Cain Merry was a particular pet of Miss Lorry's, and the lad felt grateful to her for the attention. He admired her exceedingly, and at one time had fancied himself in love with her. But Miss Lorry, experienced in admirers, laughed at him the moment she descried the early symptoms, and told him she was old enough to be his mother. It was creditable to Cain that he took the hint thus given, and devoted himself to Jane Wasp, with whom he had been in love ever since they attended the same board school. And after his passing fancy for Miss Lorry, the lad's love for the policeman's daughter became even more marked, much to the joy of Jane, who adored the dark-eyed scamp, and lost no opportunity of meeting him.

But Cain was such a Bohemian, that this was no easy matter. Owing to the nagging of his mother, he stayed away from Misery Castle as much as he could, and got jobs in the surrounding country and in London. Also there was some influence at work on Cain's character, which Jane could not understand: something that made him moody and inclined him to despair. In her simple way Jane tried to learn what it was, that she might comfort him, but Cain always baffled her.