Singing under cover of night. Imaginary carelessness

The noise of the waves always attracts lovers of sea travels, but the inspector Roderik Alleyn climbed the ladder of the Cape Feirwell ship not to have fun. He has reason to suspect that on the ship is the notorious “maniac-romantic” who is accustomed to leaving beautiful flowers on the bodies of his victims. We are ready to cling to each other"s throat?
Theatrical divas are known for the unbearable character, for which I really want to kill, and with the legendary Mary Bellah (in marriage - Mrs. Templeton), this really happened: she was killed. Moreover, on her own birthday.
But who deprived theateraries of their beloved star? Inspector Roderik Alleyn understands: literally everyone who attended her house that day had both a good motive and the opportunity to deal with the actress