What do a dog whistle that doesn't sound, a knife wielding killer at the opera and a poisoner and gun-attacking murder have in common? Captain Duncan Maclain, the blind detective must get to the bottom of these three exciting mysteries. In the Silent Whistle, he must discover who killed the young movie manager and where the money has gone. In the Melody in Death, who is killing with a knife the people at the Opera, and in the Murderer Who Wanted More, who is killing off people in the family and why is Bonnie the next target?