14 de abril, La República is a sequel to La señora, although you don't need to see the first series to understand the sequel. The setting is 1936 Madrid, in the weeks before the outbreak of the civil war. The conflict between the nationalists and the republicans is played out in the conflict between two families, the wealthy de la Torre and the humble Prado, related by blood and connected by some contested land.
The rumblings of war set families against families, friend against friend, and members of the same household against each other. As is so often the case, it's can be hard to tell which side some is on and who you can trust.
The series isn't great, but I thought it was worth watching. I liked the characters. While I didn't necessarily like every plot turn, overall the series captures quite well the difficulty of war, especially a civil war.
Final note, if you're not a native speaker of Spanish, the dialogue is pretty easy to understand. The Castilian is pretty standard without much slang. If you need a bit of help, Spanish subtitles are available.