The Black Tulip recap

During the Dutch political violence of 1672, the brothers John and Cornelius de Witt are killed by a mob. Cornelius van Baerle, the elder Cornelius's apolitical godson, is absorbed in the Haarlem prize for the first black tulip. His jealous neighbor Isaac Boxtel denounces him after seeing political letters entrusted to him by de Witt. Van Baerle is condemned but receives a last-minute pardon from William of Orange, changing death to lifelong imprisonment. He preserves three precious bulbs and, with the help of his jailer's daughter Rosa, continues the experiment from his cell. Rosa learns to read, grows the surviving bulb, and falls in love with him. Boxtel follows under a false name, steals the flowering black tulip, and claims the prize. Rosa appeals to William with the remaining evidence. The prince exposes the theft, frees and rewards van Baerle, and approves his marriage to Rosa. The tulip is named for her, while Boxtel dies upon seeing his scheme defeated.

In 1672 the Netherlands faces invasion, political panic, and public fury against the republican leaders John and Cornelius de Witt. Cornelius has been imprisoned and tortured after William Tyckelaer accuses him of conspiring against William of Orange. Although a court orders exile rather than death, an armed crowd gathers at the prison. John enters to take his brother away, but manipulation of the guards and the mob's determination prevent their escape. Both brothers are dragged outside and killed. William of Orange, their political rival, neither joins the violence nor intervenes to save them. The narrative then turns from this national conflict toward a private legacy left by Cornelius de Witt.

Cornelius van Baerle, godson of the murdered statesman, lives quietly in Dordrecht and devotes his fortune to tulips. The Haarlem Horticultural Society has offered a great prize for the first perfect black tulip, and van Baerle has bred three bulbs that may achieve it. His neighbor Isaac Boxtel, another grower, watches from a hidden vantage and becomes consumed by envy. Before his death, Cornelius de Witt had sent van Baerle a sealed packet of political letters for safekeeping. Van Baerle has scarcely thought about them, but Boxtel sees an opportunity and informs the authorities. Soldiers arrest van Baerle, discover the letters, and destroy his garden. He manages to keep the three bulbs with him as he is taken to the same prison that held his godfather.

The political letters are treated as evidence of treason, even though van Baerle accepted them without knowing their contents and has taken no part in public affairs. He is condemned to death and prepares to face execution, thinking chiefly about the loss of his black-tulip bulbs. Rosa, the jailer's daughter, is moved by his innocence and by the care he gives the bulbs. At the scaffold, a message from William of Orange commutes the sentence to perpetual imprisonment. Van Baerle is transferred to the fortress of Loevestein under Rosa's father, Gryphus. The pardon saves his life but leaves him cut off from his garden, freedom, and any ordinary chance to compete for the Haarlem prize.

At Loevestein, van Baerle and Rosa communicate through the prison window despite Gryphus's suspicion. Van Baerle teaches Rosa to read and write, while she becomes the hands and freedom his horticultural work requires. They plan how to protect and plant the bulbs outside his cell. Gryphus discovers one attempt and destroys a bulb, making the surviving specimens even more precious. Rosa secretly tends another according to van Baerle's instructions. Their lessons and shared purpose deepen into love, though van Baerle's intense concern for the flower sometimes makes Rosa wonder whether he values the tulip more than her. Meanwhile Boxtel has followed them and, under the name Jacob Gisels, seeks access to Rosa and information about the plant.

Rosa continues the cultivation in secrecy as the plant strengthens and forms a bud. Boxtel watches her movements, courts her under his false identity, and tries to learn where she keeps the pot. Van Baerle recognizes the danger but can do little from his cell, and his warnings create tension with Rosa. At last the tulip opens completely black, fulfilling the Haarlem challenge. Rosa sends word of the success and prepares to establish van Baerle's claim. Before the flower can be secured, Boxtel steals the pot and carries it away, intending to present the achievement as his own. Rosa finds the plant gone and realizes that the supposed admirer has been waiting for this moment.

Boxtel presents the black tulip to Van Systens, president of the Haarlem Horticultural Society, and claims the prize. Rosa follows and insists that the flower was grown by her from van Baerle's bulb, but Boxtel has possession of the plant and tries to portray her story as theft or confusion. Rosa retains the third bulb and knows details of the cultivation that can support her account. Refusing to let prison authority or Boxtel's confidence settle the matter, she appeals directly to William of Orange. The prince listens to the competing claims and also has access to the political history that led to van Baerle's sentence. The horticultural dispute becomes a final test of Rosa's credibility and of whether van Baerle can be separated from the de Witt conspiracy attributed to him.

At Haarlem, William of Orange resolves both the claim to the tulip and van Baerle's fate. Rosa's remaining bulb, her knowledge of the plant, and the circumstances of Boxtel's pursuit prove that she cultivated the flower from van Baerle's work and that Boxtel stole it. The prince also accepts that van Baerle held Cornelius de Witt's letters innocently and was never a political conspirator. Boxtel is exposed before the society and dies when the success he coveted is awarded to his rival. Van Baerle is released, receives the prize, and is reunited with Rosa. William approves their marriage, and the black tulip is registered under a name honoring Rosa. The couple leave the prison ordeal with their future secured and with the celebrated flower recognized as their joint achievement.

Rosa brings her remaining bulb and her account of the theft to William of Orange, giving him the means to test Boxtel's claim to the black tulip. At the Haarlem celebration, the prince establishes that the flower was cultivated by Rosa from one of Cornelius van Baerle's bulbs and that Boxtel stole it. Boxtel's long campaign of envy collapses; overcome when van Baerle is vindicated, he dies. William also recognizes that van Baerle was an innocent keeper of the de Witt correspondence rather than a political conspirator. He pardons and releases him, confirms his right to the horticultural prize, and permits him to marry Rosa. The black tulip is named Rosa Baerlaensis in her honor. Van Baerle leaves prison with Rosa, his reputation and fortune restored, while the flower created through their shared patience becomes the public proof of both his achievement and her courage.