'' ` Thief ' '' is a 1999 alternative rock song by the Canadian alternative rock band Our Lady Peace and is the third single from their third studio album Happiness ... Is Not a Fish That You Can Catch , which was released in 1999 . `` Thief '' is a song written and performed by Canadian rock band Our Lady Peace and released in 1999 on the album Happiness ... Is Not a Fish That You Can Catch .