But Sergeant Mahan caught sight of him just as the dog was mounting the last of the steps leading into the church. As a rule, when Bruce went investigating, he walked carelessly and with his tail slightly a-wag. Now his tail was stiff as an icicle, and he moved warily, on the tips of his toes. His tawny-maned neck was low. Mahan, understanding dogs, did not like the collie's demeanor.