Maulana Hussain Ahmed Madani (RA) while teaching Hadeeth at Masjidun-Nabawi compiled a book containing ONLY Saheeh & Hasan Ahadeeth (with Takhreej) about Dajjal, Mehdi, Isa (AS) etc. in the later part of life but the book never got published.
The manuscript got lost and despite repeated efforts of successive Ulama it was never found until 30+ years later when it was discovered in a small Maktab in Makkah.
This was the draft copy prepared by Maulana Hussain Ahmed Madani (RA) as it has copious notes etc.
I went to Siddiqui trust (Bolton) and found a recently published book called "Qiyamat Say Pehlay Kiya Ho Ga" (What will happen BEFORE Qiyamah); the publishers have combined 3-4 books on the subject all containing ONLY Saheeh & Hasan Ahadeeth and Maulana Hussain Ahmed Madani (RA) book is also part of the collection.
Very interesting and sobering read indeed.