Trying to track down a story

I'm a new member to this forum so please bear with me...

I am working my way through 'Gene's Story' by Karen Lockhart in which she makes reference to a story where, I quote:

'Another one I liked was about entertainers on a cruise ship in the Mediterranean. A trio of girls needed a replacement singer, so a male cousin was talked into masquerading as a female.

I was wondering if anyone could identify that story/author for me.

Many thanks in advance
Tom (Taxidermist)