#and why was young rookwood on the scene of the crime

From the Ministry Archives:

Auror Report
Date: 28 December 1968
Location: Hoxheath, Cambridgeshire
Complainant: Ms. Maggie Blenkinsop
Complaint: Possible break-in, Rookwood home.
Investigated by: Aurors Samuel Smith and Marcus Fortescue

Time: 8 PM

Witness reports: 

At 7:45 PM Mrs Blenkinsop reports seeing a tall, thin person in black dragging something dark and bulky through the Rookwood’s back garden.

Follow up indicates that nothing was stolen from the house. No apparent sign of break-in. No wards found around the house.

Ministry employee Unspeakable Caius Rookwood’s body found in adjourning field. Cursory tests indicate use of semi-dark magic.

Family not available for questioning at the time. Claims out on visit to Claudia Avery at the time. Claudia Avery corroborates statement.

Actions taken: File for Form 130 under Auror Procedure Guidelines, investigation of murder.
Status: Pending.

Form 130: Investigation for Murder
Date: 28 December 1968
Location: Hoxheath, Cambridgeshire
Victim name: Caius Rookwood
Cause of death: Unknown, possible use of semi-dark magic
Description: Victim found ripped open diagonally from throat to hip, entrails forcefully removed, key indicators of entrail-expelling curse. Greenish traces in skin suggest possible use of spell URA01. 
Investigating Auror: Rufus Scrimgeour
Notes: Judging by bone and tissue damage, possible use of spell URA02 to inflict injury. Strongly suspect premeditation, investigate DoM employees who might have known more about Caius Rookwood.

Section of interview with Rookwood’s son, Augustus reproduced here, of possible interest and further follow up:

RS: Those robes you’re wearing, quite dirty aren’t they?

AR: I don’t see how that’s your - 

RS: Got mud on them. What’s your shoe size Rookwood?

AR: 11 - 10 - I don’t know

RS: We could measure it right here if you want - 

AR: 9.

RS: I’m sure you won’t have any problem handing me the boots you’re wearing right now.

AR: Look here - 

RS: Or do you have a problem Mr Rookwood?

AR: No

Boot prints match those found near Caius Rookwood’s body.

Sign: Rufus Scrimgeour

Addendum: Rufus Scrimgeour pulled from case 05/01/1969, Andrew Travers investigating case starting 06/01/1969. Reasons for withdrawal of Auror Scrimgeour from case unspecified. - Auror Bones.

Auror Scrimgeour’s notes on Augustus Rookwood unnecessary. Boy claims he found his father lying there and was understandably shaken. Suggest Auror Scrimgeour take a few OWLs in human behaviour - Auror Travers.

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From the Auror Office
To: Head of the Auror Office
Dispatched: 1 AM 3rd August 2014
Copy to: Office of the Permanent Private Undersecretary, Department of Magical Law Enforcement
Status: Private

Harry I think you should take a look at this.
- S.B.