The Bachelor by Stella Gibbons
Brother and sister, Constance and Kenneth Fielding live in calm respectability, just out of reach of London and the Blitz. But when a series of uninvited guests converge upon them - from a Balkan exile to Ken's old flame and the siblings' own raffish father - the household struggles to preserve its precious peace. In this full house, in a quiet corner of suburbia, no one expects to find romance.