When 13 year old Bob decide to handover certain family artifacts and heirlooms of over 300 years to the British National Museum, an ancient war resumes and to stop the war, Bob has to go into the past to right the wrongs made by his ancestors.

I hear you loud and clear JanCabal... Perception is the main challenge here. Writing is just like art, people can read different meanings into a piece of work and people can give different "expert" opinions based on varying p.o.v.

As sharkeatingman once replied to me, writing loglines is an excellent tool to uncover potential weaknesses of the script in the entire beginning of the process. And I have to agree. You can spend one week shaping up your logline to save months writing the script which you won't sell - because you will fail to present it to someone who matter with an intriguing logline. It helps you to identify basics - protagonist, antagonist, inciting incident, goals and whats a at stake.

"He have to correct mistakes" is very unclear whats going on - It can be minor thing, or it can be chain of important events and smart manipulations. Trait of a hero may give us a clue how he will do that. Cunningt, genius, courageous ...

Lines about history if its 300 or 500 does not matter in the logline. Same goes for the name of protagonist or which museum it is. You can save some words by cutting that out.

Hope it helps!

Thanks nicholasandrewhalls...

Is it just me or it's easier to write a script than write a logline? :)

I don't want to get sucked into a situation whereby progress is dependent on a logline.

"A young boys quest to close a dark chapter of his lineage unwittingly opens up a whole new world of trouble for him."

OR

"A young boy's quest to close a dark chapter of his lineage unwittingly rekindles an age long war which he struggles to stop."

As an aside, I came across this website which you might find useful -

http://www.twoadverbs.com/logline.pdf