The Adamant is a unique day-care centre. A floating structure located on the Seine in the heart of Paris, it welcomes adults suffering from mental disorders, offering the kind of care that grounds them in time and space and helps them to recover or keep up their spirits. The team running it tries to resist the deterioration and dehumanisation of psychiatry as best as they can.
Buck Russell, a lovable but slovenly bachelor, suddenly becomes the temporary caretaker of his nephew and nieces after a family emergency. His freewheeling attitude soon causes tension with his older niece Tia, loyal girlfriend Chanice and just about everyone else who crosses his path.