New to my books? I'd recommend starting with one of the following titles: 

Like urban fantasy packed with menacing faeries and magical action? Try Faerie Blood.
Like the sound of dragon shifters in post-faerie apocalypse London? Try Alight.
Are devious demons more your thing? Try Celestial Magic.
Does the idea of urban fantasy for gamers sound appealing? Try Thief of Souls. 
Do you like the sound of weird contemporary fantasy that takes place in a vast Multiverse? Try Adamant.