Short answers, pulled from the story.
Carol II was King of Romania from the 8th of June 1930 to the 6th of September 1940. He was the eldest son of King Ferdinand I and came to the throne through a coup that deposed his own son, Michael, before being forced to abdicate by General Ion Antonescu.
Carol II abdicated on the 6th of September 1940 after the fragmentation of Greater Romania, when Bessarabia and Northern Bukovina were ceded to the Soviet Union, Northern Transylvania to Hungary, and Southern Dobruja to Bulgaria. His reputation was destroyed by these territorial losses and he was forced out by General Ion Antonescu, the Nazi-backed prime minister.
Magda Lupescu, born Elena Lupescu in 1895, was Carol II's longtime mistress and eventually his wife, whom he married in Brazil in 1947. She was Roman Catholic but widely perceived as Jewish because of her parents' background, and known to Romanians as the 'Red Queen' for the color of her hair. She was deeply unpopular for using her connections to the Crown for corrupt financial transactions and for her extravagant spending during the Great Depression.
The night of the 30th of November 1938, known in Romanian history as 'the night of the vampires,' was when Carol II ordered Iron Guard leader Corneliu Zelea Codreanu and thirteen other Iron Guard leaders murdered in prison. The official account claimed they had been 'shot while trying to escape.'
On the 10th of February 1938, Carol II suspended the constitution and seized emergency powers, then drafted a new authoritarian constitution that concentrated nearly all governing power in his hands. The constitution was approved in a plebiscite where silence was counted as a yes vote, yielding a reported result of 99.87 percent in favor. He abolished all political parties and established the National Renaissance Front as the sole legal party in December 1938.
Romania produced 6.6 million tons of crude oil in 1938, making it a critical supplier for Germany, which had almost no domestic oil production. Germany's Four-Year Plan needed to import 400,000 tons of oil per month but had imported only 61,000 tons per month in the final four months of 1938. Control of Romanian oil was a key German foreign policy goal throughout the Carol II period.