On the morning of Friday 5th February, 1927, Miss Agnes Humphries - the landlady of the attractive, if-slightly-shabby, white-fronted townhouse at Number 23 Burlington Square - has a decision to make.

The rooms of the second floor lie empty, since poor Mr Blandford's unfortunate demise, God rest his soul. And Agnes must make up her mind as to who will be her new lodger... Will it be her spirited, young niece Clara, who drifts through the glamorous world of London's Bright Young Things? Or Stephen, the sensible, church-going, respectable banker who seems just be too good to be true? Or the timid war widow named Mercy, who is clearly running from something - or someone...?

Agnes must choose between them. But what will her decision lead to? One of the choices could result in scandal, one in devastation, and one could even lead to happiness. If only she gets it right...

As all three lodgers enter Number 23, in alternate timelines, relationships are formed and destroyed, feathers are ruffled, and secrets are exposed. Three different choices. Three very different paths. And Agnes is to discover that nobody - including herself - is quite who they seem...