Christine Keller, successful at work, but still single, has a burning desire for a child. However, the search for the right father gave her up in frustration. She would like to have a child without a husband - but where does she get a grower from? Isa, her best friend from youth days, would love to help and has a tricky idea: Fabian, Isa's partner, should be "loaned" to the girlfriend - and may not notice. But the not quite everyday friendship service has unimaginable consequences.