I’m an innocent soviet citizen who has been abducted by the KGB on suspicion of crime against the state, what will happen to me over the few weeks? Is there a chance of release? What if they force me to sign a false confession and I refuse?

I can recommend some memoirs of arrest and imprisonment under Stalin.

"Into the Whirlwind" by Yevgenia Ginzburg describes her arrest, interrogation and imprisonment during the Great Terror. She was the wife of a well-known poet who had enemies in the literary establishment. She and her husband were arrested on spurious charges which changed from one interrogation to the next.

"True Stories" by Lev Razgon describes his own story and that of other prisoners. He was a journalist, also arrested on spurious charges in 1937.

"The Great Game" by Leopold Trepper. He was a GRU (military intelligence) officer who headed the "Red Orchestra" spy ring. The last quarter of the book describes his arrest and imprisonment on no charges at all and his time in the prison of the Lubyanka building and the other prisoners of state that he met there.