The Mysteries of Verbena House, or, Miss Bellasis Birched for Thieving is a pornographic novel of flagellation erotica set in a girls' school, written under the pseudonym Etonensis by George Augustus Sala and completed by James Campbell Reddie (co-author of The Sins of the Cities of the Plain).

[1] The book is set at Verbena House, an exclusive girls' school in Brighton, and concerns the flogging of a schoolgirl called Miss Bellasis, who has stolen two gold coins from another pupil.

The headmistress, Miss Sinclair, is at first reluctant to flog the girls for their misdemeanours but defers to the wisdom in these matters of the German and French teachers and of her spiritual advisor the Rev.

The latter relates his experiences of flogging at Eton and wishes to witness the birching of Miss Bellasis.

According to the Victorian pornographer Henry Spencer Ashbee, it is this point that the hand of another author is detectable and the action becomes more explicit: "the castigation of Miss Bellasis is described at great, perhaps too great length" and the erstwhile maidenly headmistress who "was not by any means a flogging school-mistress" is transformed into "the lascivious lady of Verbena House".