John Watson found it most fascinating when his newest patient turned out to be the surrogate for the soon-to-be-married uber-powerful talent agent Simon Pearson and the up-and-coming politican Vernon Laing. But when Simon's business partners start to worry that he's more interested in his husband-to-be's career and not the next big Hollywood actor desperate for some West-End credibility, they decide that there's only one person they can trust to investigate this discreetly.
But when he rejects their initial overtures, the partners won't take 'no' for an answer. They hire his law firm and Holmes - on the cusp of being made the first non-named partner in the history of Fothergill, Patricks & Havers - finds himself with no choice but to get involved in a messy investigation that touches on many aspects of the modern gay family.
Prevented from assisting Holmes due to client-patient confidentially rules, Watson finds himself wondering why his own family thinks Holmes is so damn wonderful, what church will the 'gay wedding-of-the-season' be held in and what is the right colour tie to buy his boyfriend?
But for Holmes, as he digs for dirt on Vernon Laing, he starts to realise that not everyone is as innocent as they seem and maybe Vernon's the victim instead of the villian.
For the fourth time around, Holmes & Watson find themselves on another adventure which takes them from Devon to Provincetown, from Michelin-starred restaurants to sex clubs and with just enough one-liners and inappropriate sexual encounters to keep things going.