Compond Index And Key Faster/better?

In a situation where you have two tables in a hierarchy like this:

create table authors (authorid int identity (1,1))

create table books (
authorid int,
bookid int identity (1,1)
)

Is there any disadvantage to having the primary key and the clustered
index as a compound key, like this:

alter table books add constraint PK_books primary key clustered
(authored, bookid)

Normally, I would make bookid the key, but then I got to thinking, most
of the queries are going to be "select * from books where authorid =
@@some_authorID"

So, wouldn't a compound key and index make this a little faster?