The Sixth Wicked Child is the third and final book in the 4MK thriller series by JD Barker. This book wrapped up this thrilling and suspenseful trilogy. I felt like I went into this one with higher expectations and wanting something really explosive and while this conclusion was solid and wrapped everything up in a satisfying way, overall I felt like it could have been a bit more. It was intense and kept me interested. I'm glad I read it and can see why this series gets so much hype.