Death at King Arthur's Court — Richard Forrest

Children's book author Lyon Wentworth must solve an impossible locked-room murder with a medieval twist -- or risk landing on death row.

Lyon Wentworth sprints through the woods, chest heaving, dragging a broadsword behind him. He doesn't remember why he started running, or when he picked up the sword, but he knows that if he stops, he'll die. When he trips, his attacker is upon him within seconds, but the executioner disappears before he can deliver the final blow. He's got the wrong man; Lyon isn't the one he wants dead.
 
A mild-mannered Connecticut children's book author, Lyon has been drugged, chased, and scared half to death, but why? When he returns to his house, clothes torn and bloody, Lyon knocks on the door of the RV parked in his driveway, where his old friend Morgan has been staying,  but there's no answer. When he finally gets the door open, Lyon finds Morgan dead -- hacked to pieces with a broadsword.
 
This incredible locked-room mystery is only the beginning of the incredible Death at King Arthur's Court. The final book in the Lyon and Bea Wentworth Mysteries, it provides a fitting conclusion to the series by presenting Lyon with his most challenging choice yet: solve the mystery or die.
 
Death at King Arthur's Court is the 10th book in the Lyon and Bea Wentworth Mysteries, but you may enjoy reading the series in any order.