I'm not sure specifically as I haven't read it yet. But generally, a 'love story' might involve the relationship between characters, their growth through love, and perhaps the challenges they face in the context of the 'fortress' which could be a literal or metaphorical place.
Well, without having read 'danielle trussoni the fortress a love story', it's hard to say for certain. However, from the title, we can assume that the story is centered around a love affair that takes place within or in relation to a fortress. It could be about two people who find love in a place that is perhaps difficult to access or filled with secrets, like a fortress often is in literature.
Since I haven't delved into 'danielle trussoni the fortress a love story', this is just speculation. Maybe it tells the story of a couple where one of them is associated with a fortress, like living in it or having some connection to it. The love story could unfold as they navigate their feelings for each other against the backdrop of this fortress, which might represent protection, isolation, or a world of its own. It could also explore how their love is affected by the events and people within this fortress - like family members if it's a family - owned fortress or other inhabitants if it's a more public - use fortress.