Ace Atkins has published a bunch of estate-approved continuation titles in Robert B Parker’s Spenser series. I’ve read and liked several of them. Wonderland is the third of the continuation books, although it has recently been re-issued with a new title, Spenser Confidential, apparently as part of a movie tie with Netflix. In any case, whatever the book is called, it’s on sale at Kindle UK today for £1.99.
Buy at Kindle UK