Some lines are never meant to be crossed.Ellie Hargrove built a life that looks perfect from the outside. A beautiful home. A successful husband. A son she loves more than anything. Everything is stable, quiet, and carefully arranged. But beneath the calm surface of her marriage, something essential has gone missing.When her son returns home for winter break and brings his college roommate with him, Ellie expects nothing more than a few extra voices in the house. Nico is thoughtful, observant, and far too easy to talk to. What begins as harmless conversation slowly becomes something more dangerous. A look that lingers too long. A quiet moment that changes everything.Ellie knows the rules. She knows the boundaries that hold her life together. But desire does not always arrive with warning, and the heart rarely listens to reason.As the winter deepens and the silence inside her marriage grows louder, Ellie must face the truth about what she wants, what she has lost, and what she is willing to risk.Lines We Cross is a slow burning story of temptation, emotional awakening, and the fragile boundaries between loyalty and longing.This complete collection includes all three novels in the seriesThe Winter GuestThe Second CrossingThe Cost of CrossingSome choices change everything.Some lines, once crossed, can never be undone.