Corrupted

I think CORRUPTED has got to be the BEST in the Jason King series.
In this book Jason's handler contacts him while he's recuperating from injuries sustained during his last mission. She gives him an assignment but doesn't tell him that it's a personal assignment for her and not sanctioned. When the mission goes awry, Jason goes rogue and decides to complete it anyway. Jason comes up against a formidable opponent and with out assistance from a friend he may not have survived. He survives only to face an even larger opponent, the United States.
Roger Wayne does an excellent job narrating.
HIGHLY RECOMMENDED.
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If Will Slater keeps showing up to save Jason King's life, the named protagonist is going to have to change. Slater's prior appearance was in Reloaded, Book 3 in the Jason King series. He was sent to kill King but helped him instead. Slater then went AWOL from Black Force and is now on the run. Black Force is a secret US government military agency. Isla, King's handler and Slater's ex-handler, sends King on an unapproved personal mission in extreme eastern Russia.

Corrupted is a standalone novel, but it ends in a semi-incomplete situation setting up Book 6. Corrupted is brutally violent and has over-the-top suspense of the type that can cause some authors to forget the plot to focus on action instead. Author Matt Rogers passes that test by staying with the excellent plot. Roger Wayne does a nice job of narrating as usual.