Newly retired Philip returns home to Cologne and is thrown into emotional turmoil upon bumping into his long-lost sweetheart. In the midst of a domestic crisis, Ricarda confides in Philip that she is looking for somewhere to live. And there and then, Philip suggests that she move in with him - he is setting up a flatshare. Will she join him with his mischievous dachshund named Ralf?
To his surprise, Ricarda agrees, leaving Philip to scramble together a crew of retirees in time for spring, for the most unlikely of social experiments. There's grumpy, cigarette-smoking grandfather Harry; quiet and discreet Eckart, curiously carting around his late wife's headstone; Uschi, brimming with life, harbouring a passion for leotards and aerobics along with sausages and outrageous knitting patterns; and then ever-practical and warmhearted Ricarda, towards whom Phillip is developing real feelings.
Despite their differences, the flatmates thrive and embark on a series of new adventures. But when Uschi falls unwell, familiar cracks begin to show, and this uniquely spirited club of friends must work together in order to survive - and truly blossom.