Hazel is a scientist used to searching for perfect formulas. Ilaria, instead, is chaos: a whirlwind of beauty, desire, and secrets that always return to knock on her door. When their lives cross again, nothing is ever the same.

Between night trains, hotel rooms, and distant beaches, the two women chase a love impossible to explain and impossible to extinguish. Every encounter is an emotional experiment: the warmth of a kiss, the silence heavier than words, the fear of staying and the fear of running away.

It is a journey that passes through Paris, Berlin, the Algarve, and Milan, but above all, the most intimate borders of the heart. Here Hazel discovers that passion cannot be calculated, nostalgia cannot be tamed, and certain bonds never truly end: they remain suspended, like an unfinished equation.

✨ A sapphic novel that intertwines science and feeling, body and soul, reason and madness.

An ode to love that resists, even when everything seems lost.