The aim of the study was to describe Registered Nurses’ (RNs) experiences of their work environment in residential care homes for older persons. Twelve RNs were interviewed and latent content analysis was used for analysing the data. The data were collected in the spring of 2006. The findings revealed that these RNs experienced a paradoxical work environment: feeling appreciated and valuable, whilst at the same time feeling underestimated and frustrated. They felt appreciated and valuable when they provided nursing care and trust and support to others. The RNs experienced a positive work environment when the border between social and nursing care were clear. They also felt frustrated when they were expected to ‘be everywhere and to know everything’, but at the same time they felt invisible and underestimated. They experienced themselves as ‘lonely fixers’, having the ability to solve practical problems when the older persons were discharged from hospital and expected to be able to provide specialist nursing care without having specialised competence and specialist staff team members. In conclusion, it is important that the RNs can identify the border for nursing care. When these are clear, the nursing care objectives are apparent and the RNs become more autonomous, visible and listened to. The manager should listen to and support the RNs, with continuous supervision and competence development being mandatory elements. It is a difficult task for RNs working in residential care homes to meet all of the expectations placed on them, resulting in a risk of moral distress, making mistakes and developing illnesses caused by stress.