NiceSlythernCathy
( summer before 4th year, there's the 5th year stuff happening but in the summer before 4th)
While at Grimmauld place Harry Explores the house/place, but while Harry is going through the Box's in the attic, he finds something, the beaten,broken,dead diary of Abraxas Malfoy, after reading, he, hesitated, to go to the portrait of the late Walburga Black, she never liked anyone really but after getting to know Harry, she tells him all that he needs to know about the late Abraxas Malfoy, after reading it Harry's not sure weather to go to Sirius O.Black Or Abraxas's son, Lucius A.Malfoy.
Read to find out
So I'm probably gonna make a part 2 book just because this isn't what I I am going towards