Nobody Home

Oh dear.  I've been watching Mrs. Robin and her new home since I first discovered her in the rhododendron exactly one week ago.  Every time I've passed by and peeked, she's been patiently sitting in her nest incubating her clutch of eggs -- or so I thought. 

Today, walking back from collecting the mail, I noticed she wasn't there.  On closer inspection, I discovered the nest was completely empty -- not an egg to be seen.  I don't know if this was a hysterical pregnancy, or if something untoward happened in the night.  There doesn't seem to be any sign of a disturbance.  I was so looking forward to seeing baby robins!