Severus Snape was exiled from Hogwarts due to a 'Secret' plan between Dumbledore and himself. He lost his teaching position and his friends.
Lord Gaunt (A.K.A Dark Lord) Took Severus in after the Order of the Pheonix 'Destroyed' his house and almost everything in it.
Severus has been staying at Gaunt Manor and his whole world is about to be turned upside down when he meets Tom's son; Kadance Thomas Salazar Gaunt.
The Order of the Pheonix is in for a surprise when they find out both Hermione and Ron whom was with Harry Potter disappeared and are 'Mates' to someone of the so-called Dark Side!