Bail bondsman Deon Carver is found with his skull smashed with a sharpshooter cup in his office. Interference on a walkie-talkie leads to the discovery of a bug that was planted in his office. Another strange finding is the killer appears to have called 911 after searching the office for an hour. While searching the body at the morgue, Lanie finds a piece of paper hidden in his Deon's sock with apparently random lines drawn on it. Castle and Becket investigate Deon's criminal clientele, starting with repeat-offender Random Pierce. But when Random runs, he is captured by bounty hunter Mike Royce, formerly Becket's training officer after she graduated the Police Academy. They soon find out it all relates to missing gems from a previous robbery, which several other suspects could be after, including priest Arron Roe, Carver's widow and some ex-cons.
—KGF Vissers