Accurate synopsis, please.

This morning I had things to do and wanted to enjoy a 10 -20 minute read of a complete story before starting them. I read a synopsis of one and there was nothing in it to indicate it was anything other than a complete story, although length was not indicated. I read it within my time frame but found it to be what certainly seemed to be the first part of a multi-part story. If this was indeed the author's intent, I wish she/he had indicated it as such.