The twistiest murder mystery you are ever likely to read?

A story about a family that does the unthinkable in order to save the life of one of its beloved members?

Both? Or something else altogether?

You'll have to read until the very last word in order to find out…

You think it will never happen to the ring of the bell, the policeman on the doorstep. What he says traps you in a nightmare that starts with the words, 'I'm afraid…'

Sally Lambert is also afraid, and desperate enough to consider the unthinkable. Is it really, definitely, impossible to escape from this horror? Maybe not. There's always something you can do, right?

Of course, no one would ever do this particular something – except the Lamberts, who might have to.

No one has ever gone this far. Until Sally decides that the Lamberts will…