The actual case is resolved early during a short, awkward exchange featuring the Lieutenant in a neck brace. The rest of the episode is a glossy, juicy soap opera focused on Trish Van Devere's character continually fighting against ever-mounting forces that have been pre-determined to close in on her.
One of the most controversial and universally hated episodes - especially among Columbo fans - Last Salute is definitely an acquired taste...BUT...if you can look past the dumb unnecessary quirks which McGoohan the director injects into the main character - it's actually quite a fun romp.