Celena Costello arrives at Hogwarts to occupy the position of Master of Potions

Professor Costello starts her term at Hogwarts at the start-of-term feast and Sorting ceremony.        

Celena starts her exciting career as Hogwarts Master of Potions; the first lesson goes better than she expected

Celena Costello, the new Potions Master at Hogwarts, plans a challenging and fun lesson for her sixth-years. However, it doesn't go quite as she expects it to...

A cup of tea with Hagrid ends very interestingly.

Celena discovers a secret of the Forbidden Forest... crossover with the 90's TV Show "The Gargoyles"

What is the real reason Dennis Creevey is asking for private lessons?

Celena discovers her fiance's betrayal

"Yes." Snape said calmly, slowly, contemplating the skull-like shape on his forearm, and seeing Celena's expression of horror and shock, "The Dark Mark."

It's a Gryffindor victory against Slytherin, but Dennis still finds a reason to be disappointed

To Celena's frustration, Fleur sets her up on a blind date, during which Celena makes an amazing discovery

Once Celena had uncovered a nugget of truth, she will not rest until she knows it all. She attempts to find out more about the dark secret revealed to her by Charlie - in between Christmas shopping.

A Christmas party gets rather interesting when Professor Snape takes Celena's hand and leads her to the dance floor.

"It appears," Snape put in, every word dripping with venom, "that Professor Costello feels there is nothing she isn't supposed to know… and nothing she isn't supposed to let out."

Celena discovers a mysterious photograph in Professor Snape's office. 

If anyone had asked Celena with whom she would least of all want to go into the dark and dangerous Forbidden Forest in the dead of night, she most likely would have named Professor Snape...

It took her a lot of courage to pull her wand out at Snape. It took even more courage to go down to his office with a box of home-baked cookies.

Firenze reveals to Celena some of the part she is meant to play in dealing with the recent sinister events

Celena receives a visit from the past and takes a step towards the future

How a couple of Dementors and some Firewhisky can give things a very interesting turn. Finally some romance.

Three werewolves. A vampire. And one man...

Fleur plays matchmaker again and makes Snape dine with the Weasleys.

Severus Snape finally has to come to term with his feelings.

Alliances and preparations for the future war.

Severus and Celena get married and the hunt continues.