21.   Some officials said the Etireno had been confused with a second ship, whose name and whereabouts remain a mystery.

22.   That raised speculation that the Etireno had been confused with a second ship, whose name and whereabouts remain a mystery.

23.   The killings remained a mystery until detectives began looking into cellular telephone calls that Stahl had made to Vasco, Carroll said.

24.   When Lee died -- and how -- remained a mystery.