Book 1 of the Saint of Steel 
Whilst foraging for startleflower, perfumer Grace finds herself pursued by ruffians and rescued by a handsome paladin in shining armour. Only, to outwit her hunters they must pretend to be doing something very unrespectable in an alleyway.
Stephen, a broken paladin, spends his time knitting socks and working as a bodyguard, living only for the chance to be useful. But that all changes when he saves Grace and witnesses an assassination attempt gone wrong. Now, Stephen and Grace must navigate a web of treachery and poisoners, while a cryptic killer stalks one step behind.
T. Kingfisher