In the Welsh borders, isolated by heavy snow and flooding from the thaw, cut off from telephone access, a tragedy has occurred. Old Dr Robinson known to be 'a menace' on the roads has met his end in a car crash, his big saloon thrown from the track down the steep hillside. But when the police arrive there is more to the tragedy than meets the eye: why was there a second body - an outsider to these parts - in the back of the vehicle?

The reverend Dodd, vicar of the quiet Cornish village of Boscawen, spends his evenings reading detective stories by the fireside - but heaven forbid that the shadow of any real crime should ever fall across his seaside parish. But the vicar's peace is shattered one stormy night when Julius Tregarthan, an ill-tempered magistrate, is found at his house in Boscawen with a bullet through his head. The local police inspector is baffled by the lack of clues.

The discovery of Sir Robert Boniface's body on the floor of his limousine was made quite accidentally on a sultry Friday evening towards the end of June. The industrial and financial tycoon, and former stalwart of the British Cabinet, was shot in the head and left in the quiet Vale of Health. Nearby, a rejected portrait of Sir Robert is found riddled with bullets in the studio of the now missing artist Matt Caldwell.

While hot on the heels of serial coupon-racketeer Gordon Ginner, Chief Inspector MacDonald of Scotland Yard receives word of an intriguing incident up in Lancashire – the summer cottage of local farmer Giles Hoggett has been broken into, with an assortment of seemingly random items missing which include a complete reel of salmon line, a large sack, and two iron dogs from his fireplace. What first appears as a simple break-in quickly spirals into a mystery of contested land grabs for fishing between farmers, made all the more enticing to MacDonald when a body is then found in the river.

Horace Manning, scientist, recluse and 'closed book' even to his friends, is found dead in his study at 4a.m., following a dinner in honour of his daughter's engagement. An ivory-handled carving knife rests between his shoulder blades as the houseguests gather round to witness the awful crime. The telephone line has been sabotaged - a calculated murder has been committed. Rewinding twelve hours, the events of the afternoon and evening unfold, revealing a multitude of clues and motives from a closed cast of suspects.