Sister returns after ten years with a forged will and a police report, but I have Dad's secret letter

>be me
>34, living in Dad’s old flat in Clapham
>haven’t seen my sister Claire in ten years
>she never came to the funeral
>doorbell rings, it’s her
>she’s all smiles and apologies
>“Jamie, I want to make amends. Let’s sort out Dad’s estate properly.”
>I let her in, kettle on
>she asks to see the house deeds
>I say they’re with the solicitor
>she pulls out a document from her bag
>“Dad signed this a week before he died. Everything goes to me.”
>it’s a will, looks real enough
>but I remember Dad’s handwriting
>the signature is shaky, wrong
>I say no, this isn’t right
>she gets cold, fast
>“Give me the keys, Jamie. This is mine now.”
>I tell her to leave
>she does, but says police will sort it
>the next day I go to Dad’s old bank
>ask if he had a safe deposit box
>turns out he did
>I open it with the death certificate
>inside is a letter, addressed to me
>Dad’s writing, clear as day
>it says Claire had been stealing from him for years
>cheques, cash, even forged his signature on a loan
>he cut her out of the will deliberately
>“She’ll try something, son. Don’t trust her.”
>I’m shaking
>that night, cops knock on my door
>DS Patel, mid-40s, tired eyes
>“Claire filed a complaint. Says you forged the will and stole £30,000 from the estate.”
>she shows him her forged document
>I show him Dad’s letter
>he reads it twice, then sighs
>“This is a civil matter. I’ll seize your laptop and bank records for the file.”
>I ask if he’s arresting her for fraud
>he shakes his head
>“Lack of jurisdiction over inheritance disputes. CPS will decide.”
>he leaves with my laptop
>I’m left with Dad’s letter and a sister who’s probably laughing
>am I in the wrong here