[noun] + にかかっては [noun] + にかかったら [noun] + にかかると [noun] + にかかれば
にかかれば and its variants mean "in the hands of X", "once X gets hold of it": with this person involved, things turn out in a way nobody else could manage. It follows a noun, almost always a person, and the second half says what they do to the thing – often with どんなな〜も, "any…", or あっというまにあっという間に, "in no time".
The verb is かかる in the sense of coming under someone's handling, and the person takes に. The four forms differ only as the conditionals they end in: にかかれば and にかかったら are the everyday choices, and にかかると suits a general truth about the person.
The person's power can work against you. Someone who spreads gossip, wrecks toys or exaggerates everything takes the same pattern.
にかかっては leans towards giving up: against this person, you or the thing cannot hold out. It is often followed by かなわない, "no match for", or かたなし形無しだ, "is put to shame".