When a conspiracy theory podcaster is found murdered just before her talk at the TruthCon conference, Mark, Rex and the team find themselves thrown into the extreme world of conspiracy theorists. They find that one of the theorists is Mark's old commanding officer, now afflicted with PTSD. In the end, it's Rex's relationship with the old soldier that might lead them to the real killer. 

Birdwatching tourists are ruffled when they spy the body of a landowner who had hidden the nesting site of the rare Red Crossbills from them. When the team unearths a ruby from a 25-year-old jewelry heist connected to the case, Rex tracks the birdsong to find the treasure at the secret nesting site, before the killer can get there first and destroy the endangered birds standing in his way.