There are 3 books in the The Will Darling Adventures series. The newest book is Subtle Blood which came out in 2021.

1
Slippery Creatures

Book cover of Slippery Creatures
Will Darling came back from the Great War with a few scars, a lot of medals, and no idea what to do next. Inheriting his uncle’s chaotic second-hand bookshop is a blessing...until strange visitors start making threats. First a criminal gang, then the War Office, both telling Will to give…
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2
The Sugared Game

Book cover of The Sugared Game
It's been two months since Will Darling saw Kim Secretan, and he doesn't expect to see him again. What do a rough and ready soldier-turned-bookseller and a disgraced, shady aristocrat have to do with each other anyway?But when Will encounters a face from the past in a disreputable nightclub, Kim…

3
Subtle Blood

Book cover of Subtle Blood
Will Darling is all right. His business is doing well, and so is his illicit relationship with Kim Secretan--disgraced aristocrat, ex-spy, amateur book-dealer. It’s starting to feel like he’s got his life under control.And then a brutal murder in a gentleman’s club plunges them back into the shadow world of…