I don’t believe confronting personal demons is a compelling plot for a logline, it’s too vague. Confronting his past as a skinhead would, on the other hand be more specific.

Also how does someone strike comparisons with Adolf Hitler? Does he attack Poland? Does he kill innocents with gas? If so, I would add it into the logline and take away the vagueness.

Finally you add ‘raising a dangerous mob’. If this is the main conflict then I would say, A lawyer must confront a dangerous mob, if not, I would leave it out.
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“When a lawyer who’s a former skinhead defends a client who attacked Poland, he must protect him from an angry hate mob.”
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Not the best logline. for sure. because I don’t know how your client strikes comparisons with Adolf Hitler, but if you were to change that part I think it might work.

Hope this helped, good luck with this!

Although not a traditional logine I do like it.

However, one note. I would drop the word ‘Independently’ from the logline since ‘independently’ and ‘their own’ mean the same thing, also ‘plans’ imply two plans not one so you could even drop ‘their own’ as well.

You could then drop, ‘Trust is about to shatter’ and it would still retain it’s meaning.
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“When secrets threaten to surface, a husband and wife devise plans to kill each other before their pasts are revealed.”