"When a traumatized woman emerges from a river near London," A river near London? Well, let's see...The Seine is quite near London.... The River Annan is the most southerly river in Scotland - that's not so far away.... The Wye isn't far from London, either. That's in Wales.... "Her case appears to be connected to a mysterious series of disappearances. Police detective Helen Lake races to unravel the truth." She's just starting now? What's she been doing hitherto? Knitting? Wait a minute: Bird, Deacon, River, Lake? There's a secret code in there somewhere!