There are 3 books in the MK Thrillers series. The newest book is The Sixth Wicked Child which came out in 2019.

1
The Fourth Monkey

Book cover of The Fourth Monkey

`The Fourth Monkey has one of the most ingenious openings that I've read in years. This thriller never disappoints.'
James Patterson

`Superbly constructed and immaculately paced' - The Daily Mail

Brilliant. Complicated. Psychopath.

That's the Four Monkey Killer or `4MK'. A murderer with a twisted vision and absolutely no mercy.…

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2
The Fifth to Die

Book cover of The Fifth to Die
'J.D. Barker is a one-of-a-kind writer and that's a rare and special thing. Stephen King comes to mind and Lee Child, John Sanford. All one-of-a-kinds. Don't miss anything J.D. writes.' James Patterson

Murder. It's a family affair.

In the midst of one of the worst winters Chicago has seen in…

3
The Sixth Wicked Child

Book cover of The Sixth Wicked Child

In the riveting conclusion of the 4MK trilogy, Barker takes the thriller to an entirely new level. Don't miss a single word of the series James Patterson called "ingenious."

Hear No Evil

For Detective Sam Porter, the words "Father, forgive me" conjure memories long forgotten; a past intentionally buried. For…