Inspector Dork was not pleased with himself

he had interrogated everyone in the house
only to be knocked down by
impenetrable alibi

Spouse Susan slept soundly through the night
and was awakened in the morn
when the alarm bell rang in his room

Daughter Debby's room was a floor down
she was up with her studies
plugged to earphones

Son Simon was out for the night
he was at his friend's place
for a birthday party

Maid Maddie made his bed
when the clock in his master's room
was chiming ten

Butler Bill having served a glass of milk
closed the door behind him
and retired for the night.

Inspector Dork was about to leave the victim's room
when his eyes fell on the clock pendulum

it was not swinging

he knew who was lying.