Himmler biography recommendations

I may be asking the impossible -

But can anyone recommend a good not-completely-slanderous biography of Heinrich Himmler ?

I have read Unholy Alliance which is very irritating to say the least - the author basically inserts some form of slander about National Socialism and its leaders every opportunity he gets and it is completely childish. Such is the curse that is prevalent in so much literature about our movement - and it is pretty obvious who is at fault and what their agenda is - if you are on this forum you understand that quite well.

In any event, I'm sure aren't many objective bios of Himmler out there - but one that is palatable would be much appreciated.

Thanks in advance.