Boredom = stalker

Karen Bergreen's "Following Polly" was a very enjoyable read.  From the beginning the character of Alice is easy to relate to and very likable.  She gets fired from her job and becomes a shadow to superstar Polly, following her everywhere she goes, unbeknownst to Polly.  But when Polly turns up dead and Alice is the number one suspect, Alice has to figure out who really killed Polly.