IAB Sergeant Rick Stetler's vile informer Ron Saris pushes his host and former Jimmy Castigan in his pool during an argument after a party. However, the criminal is boiled alive by the high concentration of sodium hydroxide in the pool, having been added via the filtering system. Pool cleaner Pete Bishop's master-keys were stolen recently. Saris says he was threatened by Julia, who denies this but the note wasn't hers. Ryan shows Horatio Dr. Price is addicted and stole the missing pills from evidence. The alkali is traced to two more decomposing corpses. Saris points out Jimmy's accomplice.