Rosemary Boxer and Laura Thyme are two amateur green-fingered sleuths who came together through a mutual love of plants and troubled social lives. Together they start a gardening business, tackling horticultural problems for anybody who requires help. However, mystery is never very far behind them, and the dynamic and inquisitive duo tries to solve the murderous goings on whilst dealing with problems a little closer to their profession.
Horticultural lecturer Rosemary Boxer is hired by a wealthy but ill businessman to help cure a disease causing his trees to lose their bark. She gets to know Laura Thyme, who turns up after a friend is killed in a suspicious car accident, and when the pair find the lord of the manor unconscious beneath his bedroom window, they must decide whether depression led him to attempt suicide or if there is a more sinister explanation.
The amateur sleuths uncover the remains of a racehorse while engaged on horticultural work in the grounds of pop star Nev Connolly's supposedly haunted mansion. Before long, gruesome revelations are coming thick and fast as Nev is shot dead and more bones are discovered - this time belonging to a young woman. As they investigate further, Rosemary and Laura are plunged into a sinister mystery with roots deep in the past.
Laura and Rosemary are asked to restore an ornate water garden cascade in the grounds of a health spa, where they are invited to join owner Frances Caldecott and her children for dinner. That evening, the duo discover Frances has been strangled and her jewellery stolen, and set out to catch the culprit.
The duo are hired to cure a patchy lawn at a select language school hiding dark secrets. The disappearance of a Polish student alerts them to a tale of passion, rivalry and revenge, and when a handyman is found with his throat cut they race to find the killer.
Laura and Rosemary investigate the mysterious death of a blind professor caught up in a bitter battle to save his beloved allotment from an unscrupulous land developer. A heady blend of weedkiller, cannabis and high finance hangs in the air as the duo search for clues - and another body is turned up before they track down the villain.
Rosemary and Laura are employed to restore a country churchyard in time for a medieval fair, but it is not long before a local landowner is killed by an arrow beneath an ancient yew in the centre of the graveyard. The duo investigate the possibility that rival bidders for the victim's highly desirable farm are to blame - though affairs of the heart might offer a more likely motive.
The green-fingered amateur sleuths are drawn into another mystery when a barrister employing them to spruce up his garden discovers his cousin has been drowned, only for the man to be spotted alive and well a few days later.
The amateur sleuths continue their investigation after Martin Frazer's cousin, who supposedly drowned, is spotted alive and well a few days later.
The duo are enlisted to design a memorial garden based on the myth of Orpheus and Eurydice, but someone begins vandalising their work on a nightly basis. Matters are complicated still further by the death of a recovering alcoholic, whose body is found at the site.
Green-fingered amateur detectives Laura and Rosemary are called in to tackle a stubborn species of weed threatening an entire year's vintage at the Crickle Valley vineyard. However, they find themselves in the right place at the right time when the body of a wine critic is discovered on the premises.
The amateur sleuths are called to a monastery to restore a herb garden in time for a royal visit - but their pruning and planting is disrupted by the discovery of a corpse. As they investigate the death, the tight-knit community closes in around them.
Complete episode guide for Rosemary & Thyme with detailed information about every season and episode including air dates, summaries, ratings, and streaming availability in Japan.
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Rosemary's old school friend Dorothy invites the duo to restore the gardens of her beautiful villa on the French Riviera so the property can be opened to the public. The plan arouses bitter hostility among the neighbours and long-held family secrets start to surface, leading to murder.
The duo are hired to investigate why newly planted roses at an upmarket preparatory school keep dying. After witnessing the arcane ritual of the Night of the Stag, they detect tensions between modernising headmaster Quentin Marshall and established members of his staff who are harbouring secrets someone is prepared to kill for.
The green-fingered sleuths are hired to work behind the scenes of a garden makeover TV show, but Rosemary has an accident while standing in for the programme's star and ends up in hospital. Realising someone is trying to sabotage the series, Laura teams up with no-nonsense presenter Quinnie Dorell to catch the culprit.
Laura and Rosemary are hired to create a restaurant garden on Italy's Ligurian coast, but it is not long before their working holiday is disrupted by a murder. Determined to solve the crime before returning home, they find themselves with no shortage of suspects - and matters are complicated further by a second death.
An archaeologist posing as Rosemary dies mysteriously during a dig for Anglo-Saxon artefacts in the grounds of Lord Engleton's stately home, presenting the duo with a fresh mystery to solve. The gardens are unaccountably blighted by yellowing, forcing the estate to close its gates to the public, and a second death suggests somebody will go to any lengths for a piece of British history.
Laura and Rosemary are called in to investigate when gardens entered for a village contest are attacked by a disease. Further sinister undercurrents are exposed when reigning champion Donald Westward is found dead and recriminations start to fly as buried rivalries come to the surface.
The duo help reorganise the seed museum owned by the descendants of famous botanist Edwin Pargeter - but it is not long before a man is found dead in the family's garden. In an effort to trace his killer, Rosemary involves colleagues from the Royal Horticultural Society at Kew Gardens, and soon the race is on to identify a batch of mysterious seeds before it falls into the wrong hands.
The duo are invited to help create an Arabian-style garden in Malaga. Before long, a local resident is found dead, and a mysterious landowner is the chief suspect. When it transpires that someone has blocked the mountainside channels on which the new garden will rely for its supply of water, it appears the precious commodity may provide a motive for the killing.
Laura and Rosemary are hired to re-create a Victorian garden in Regent's Park, where they meet all manner of intriguing characters - but the oasis of calm in central London is shattered by the discovery of a body. The victim is a respected Harley Street psychiatrist - whose three-legged dog appears to hold the key to solving the case.
The duo are hired to create a garden as a wedding present, and find a baby under a gooseberry bush. The discovery brings out Rosemary's maternal side as the pair investigate who abandoned the child. Their task is complicated by the murder of an artistic neighbour - and the two mysterious incidents appear to be connected.
The duo visit a resort in Spain to create a trophy garden for a pro-am tennis tournament run by a former champion. When one of the competitors is found dead, everyone assumes it to be a gruesome accident - but there is more to the case than meets the eye. While investigating, Laura enters the mysterious world of bullfighting, and Rosemary rediscovers her love of motor scooters.
The green-fingered amateur detectives work on a garden for an open-air theatre, where Rosemary's cousin is due to perform. However, the production suffers a setback when an actor shoots himself during rehearsal - and the gun is found to have contained live bullets instead of blanks. A member of the cast gets an attack of stage fright, and Laura is obliged to take her place in the play as the duo try to find the culprit.