FoHV has been out for a month and still no reviews, so here's my description from my "One for All" series of decks that has a similar breakdown for each investigator:

At first glance Kate looks pretty complex, and she kind of is! If you boil her ability down it looks like this: put your clues on your tool and science cards for a +2 boost to any skill. One clue per card. You can still spend the clues, but if you find your other signature card, you can put the used clues back on your investigator for more boosts. This make her quite flexible, especially by Seeker standards, and she performs well with or without teammates around. If you want a clue focused investigator that has an answer for most situations and loves playing assets, Kate is your girl!

Her reliance on assets can also be a liability, as she needs some setup time before she really gets going. Scenarios that require you to hit the ground running, or even some bad early draws can really put the hurt on poor Kate. It's not a bad idea to have a few tricks up your sleeve that might prevent an overwhelming start. Her signature weakness also has some major potential to cause trouble, so be ready to give yourself a little willpower boost at a moment's notice.

Some archetypes that work well for this template:

The Scientist - Here's a formula for you: Tool / Science cards + tutoring / card draw + funding for both = Progress! Dedicating majority of your deck space to the aforementioned items should result in a fairly self-sustaining investigative engine, and not only does bonus card draw help you find your assets faster, it also helps dig for your Aetheric Current! Huzzah!

Precision Success - "Succeed by" cards aren't just for Rogues any more! Kate comes included with a number of cards that grant bonuses if you manage to over-succeed by a specific amount, and this pairs well with her ability to grant on-demand skill boosts if you're paying attention to what the likeliest token modifiers are. Seekers don't have a lot of options for token manipulation, but if you have a Mystic friend, there is a tonne of potential here!

Full Flex - Once Kate gets her gear set up, she can be remarkably self-sufficient. Static foot boosts, evasion bonuses, and cards that allow Kate to get out of trouble if she gets overwhelmed early on will help her get fully online without needing a babysitter for the first half of the scenario.

Clue Drop - I don't personally have the card sets to pull this off, but this is a great archetype for Kate if you have most of the newer investigator cards. Dropping clues from your assets allows you to use your powerful ability even more often, so grab cards that enable drops, and that grant benefits for doing so.

• Uniquely effective and staple cards for Kate: Flashlight, Magnifying Glass, Microscope, Chemistry Set, Dr. Milan Christopher, Ravenous Myconid, Strange Solution, No Stone Unturned, Burning the Midnight Oil, Tinker, Transmogrify, Well-Funded, Charles Ross, Esq., Dr. William T. Maleson, Feed the Mind, Fieldwork, Forced Learning, Higher Education, Jeremiah Kirby, Shrewd Analysis, "I've got a plan!", Emergency Cache, Shortcut, Preposterous Sketches, Deduction, Eureka!, True Understanding, Inquiring Mind, basic neutral skills, Delve Too Deep

Dario El-Amin uses eight (8) actions to create a two-resource surplus compared to basic Resource Actions. Emergency Cache creates a two-resource surplus in one action. Don't take him if you want to make money. It's no coincidence he carries the moniker Unscrupulous Investor.

This is hands down one of the best cards that can be gained from dead companions. I have tried it in a Leo Anderson deck (yes, I know all allies look better with Leo) and it perfectly complements his weak points. Most importantly, Anyu can always do something useful for you.

First, it can be an improved version of Pathfinder, letting you move in any window. You will use this most often.

Secondly, it can be the equivalent of a Well Prepared + Mitch Brown combo, giving you +2 to whatever test you need some help passing. It's worth to mention its own combination with Well Prepared, which will help you with the following point and in general is an outstanding upgrade in Edge of the Earth.

Finally, it can be a free evade action with a +3 (for Leo, a +1 at least for most investigators).

To top it off, Anyu can combine the 3 of them in a clutch situation to evade with 6 and then move; move, evade and investigate with +2 or any other busted burst you need.

Obviously, not all is perfect and it occupies the contested ally slot, but the free actions it provides can very well make it a better fit than most other allies in certain contexts. It's actually so good that it merits the investment in Charisma a in a deck with 2 other allies.

Not gonna lie, this looks like hot garbage, but I want to write a review in the hope that someone proves me wrong.

This costs 2 resources and an Action to give you the ability to make a test that makes an enemy not bother the party until the end of the round, so I see it as very similar to Mists of R'lyeh. Obviously, there are quite some differences:

• Different class
• Doesn't use charges and is slotless
• Parley instead of Evade
• No bonus movement (and no drawback for the scary tokens)
• Non-Elite enemies only, but can be used on enemies not engaged with you
• Test against printed health instead of evade value
• Aloof instead of exhaust if successful

Let's start with the class. While Mystics like to use on each and every test, it's one of the most common weaknesses of Rogues all around. In fact, every single green 'gator so far has an equal or higher , so why would they bother. Some of the outside-class 'gators that can take this have stats better suited for it, but Pete, Jim and Zoey have way better things to do with their limited out-of-class slots, while Leo Anderson has the means to deal with enemies in a more definitive way.
Dexter might consider this in order to have different options to play with his ability, but that comes with the age old question "why pick an Evade spell when I can pick a Fight one", especially since being a main-class Mystic means he has other options if he wants some way to deal with enemies while building as a cluever (like Mists of R'lyeh itself). The lack of charges is also kind of an anti-synergy for him, since he likes to have expended assets to throw away.
For Parallel Daisy this has the arguable advantage of being a slotless tome, thus bringing with it a stat boost and a semi-reliable way to deal with enemies, does she have the deckspace for it, though?

Now, clearly, this being a parley card we must consider it in the parley-centric investigator that got released together with this card. Thanks to this card, Alessandra Zorzi can sort-of-evade each round as a free action, but I feel like the drawbacks of having to play this in advance (contrary to the various evade events she has at her disposal), testing a lower stat and not working against Elites outweight the saved actions (even considering the engage actions you would normally take to evade an enemy engaged with a friend) and deckspace. I can see it in a level-0 deck if you have few other options, but I would upgrade out of it fairly quicky.

When it comes to the "special effects" of this card, they leave me pretty confused. Testing against health is rarely an advantage, since the few times the evade value is higher it usually means that it's easier to just kill the enemy. Giving them aloof instead of exhausting them honestly just sounds like a disadvantage: can't attack them without engaging, they will move during the enemy phase if they're hunters and you can't engage and move them around freely if you need it for some enemy-to-clue shenanigans.

All in all, looks like blackmailing ain't worth it.

Automatically engaging is an amazingly powerful effect when combined with the full choice of all enemies in the encounter deck. Whippoorwills are fairly benign, but become downright pathetic when they're face to face with the main fighter.

I'm pretty sure this works even against concealed since player cards can override game rules, so you replace the concealed spawn instructions with them being engaged with you.