The Bookman histories

"Camera obscura. A murder inside a locked and bolted room starts Lady De Winter, one of the Quiet Council's most valuable agents, on an adventure to the highest and lowest parts of Paris and beyond."@en
"A series crammed with adventures--lizard kings and swashbuckling pirates, secret government agencies and scuttling automata, tripods and airships."@en
"The Bookman. When his girlfriend is killed in a terrorist attack commited by the sinister Bookman, the young poet Orphan's quest to uncover the truth takes him from the hidden catacombs of London on the brink of revolution to the mysterious island that may hold the secret to the origin of not only the shadowy Bookman, but of Orphan himself."@en
"The great game. When Mycroft Holmes is murdered, it is up to retired shadow detective Smith to track down his killer, leading him to stumble onto the greatest conspiracy of his life. Young Lucy Westerna, Holmes' protégé, must follow her own path to the truth, while on the other side of the world, a young Harry Houdini must face his greatest feat of escape -- death itself. As their paths converge the body count mounts up, the entire world is under threat, and in a foreboding castle in the mountains of Transylvania a mysterious old man weaves a spider's web of secrets and lies."@en