The Lone Wolf by Louis Joseph Vance

With as little ceremony as though the bullet had lodged in himself, Lanyard tumbled back into the room, tripped, and fell sprawling; while to a tune of clattering boots two sergents de ville lumbered valiantly into the library and pulled up to discover Madame Omber standing calmly, safe and sound, beside her desk, and Lanyard picking himself up from the floor by the open window.

Behind them Sidonie trotted, wringing her hands.