Hare Sitting Up is a 1959 mystery thriller novel by the British writer Michael Innes.

Professor Howard Juniper, a top British research scientist working on developing a response to biological warfare has vanished and, even more alarmingly may have taken a vial of some deadly disease.

Juniper would be a top target for kidnapping from a foreign power, or equally may be suffering from a nervous breakdown.

In order to buy time, Appleby persuades his identical twin brother Miles, a schoolmaster, to take his place for a few days.

Appleby's investigations take him to the neglected country estate of a bird-obsessed earl and a top secret rocket base on an island off the northern coast of Scotland.